Smartwatches / Compare

Fitbit Sense 2 vs Fitbit Versa 4

A

Product A: Fitbit

Sense 2

105 of 150 known

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B

Product B: Fitbit

Versa 4

89 of 150 known

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Every value links to where we found it.

Only differences

AFitbit Sense 2

BFitbit Versa 4

General

5 of 10 differ

Series

Sense4Press releaseblog.google/products-and-platforms/devices/fitbit/versa-4-sense-2Read 23 October 2026Fitbit names the product Sense 2 in its Sense line and calls it its most advanced health-focused smartwatch.

Versa3Press releaseblog.google/products-and-platforms/devices/fitbit/versa-4-sense-2Read 6 October 2026

Model numbersiMaker identifiers for this exact model and its listed variants. Excludes sibling models and other generations.

FB521, FB521BKGB-US, FB521SRWT-US, FB521GLBM-US1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Regulatory notices name Model FB521 with FCC ID XRAFB521. The retail colour model numbers come from the Abt listings.19Retailer pageabt.com/Fitbit-Sense-2-Graphite-Aluminum-Shadow-Grey-Strap-Advanced-Health-Fitness-Smartwatch-24mm-FB521BKGBUS/p/182315.htmlRead 23 October 2026Abt lists manufacturer model FB521BKGB-US. FB521SRWT-US and FB521GLBM-US are on the sister Abt listings. FB521 is the model in the manual.

FB523, FB523BKBK-US, FB523SRAG-US, FB523RGRW-US, FB523RGRD1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Regulatory and Safety Notices: Model FB523 for FCC, IC, EU, UK and the IP rating. Retail colour SKUs are not stored.16Retailer pageabt.com/Fitbit-Versa-4-Graphite-Aluminum-Black-Strap-Fitness-Smartwatch-24mm-FB523BKBKUS/p/182318.htmlRead 7 October 2026Retail colour SKU FB523BKBK-US. Regulatory assembly remains FB523.17Retailer pageabt.com/Fitbit-Versa-4-Platinum-Aluminum-Waterfall-Blue-Strap-Fitness-Smartwatch-24mm-FB523SRAGUS/p/182320.htmlRead 7 October 2026Retail colour SKU FB523SRAG-US. Regulatory assembly remains FB523.18Retailer pageabt.com/Fitbit-Versa-4-Copper-Rose-Aluminum-Pink-Sand-Strap-Fitness-Smartwatch-24mm-FB523RGRWUS/p/182319.htmlRead 7 October 2026Retail colour SKU FB523RGRW-US. Regulatory assembly remains FB523.19Retailer pagephotopoint.ee/en/sports-watches/3626308-fitbit-versa-4-smart-watch-nfc-gps-satellite-amoled-touchscreen-heart-rate-monitor-activityRead 7 October 2026Retail colour SKU FB523RGRD. Regulatory assembly remains FB523.

GTIN / EAN

810073611429, 810073611443, 81007361143619Retailer pageabt.com/Fitbit-Sense-2-Graphite-Aluminum-Shadow-Grey-Strap-Advanced-Health-Fitness-Smartwatch-24mm-FB521BKGBUS/p/182315.htmlRead 23 October 2026Abt lists FB521BKGB-US with UPC 810073611429 (Graphite Aluminum with Shadow Grey band).

810073611450, 810073611474, 810073611481, 81003885874616Retailer pageabt.com/Fitbit-Versa-4-Graphite-Aluminum-Black-Strap-Fitness-Smartwatch-24mm-FB523BKBKUS/p/182318.htmlRead 7 October 2026Exact FB523BKBK-US Black / Graphite Aluminum listing identifies 810073611450. Regional identifiers are not exchanged.17Retailer pageabt.com/Fitbit-Versa-4-Platinum-Aluminum-Waterfall-Blue-Strap-Fitness-Smartwatch-24mm-FB523SRAGUS/p/182320.htmlRead 7 October 2026Exact FB523SRAG-US Waterfall Blue / Platinum Aluminum listing identifies 810073611474. Regional identifiers are not exchanged.18Retailer pageabt.com/Fitbit-Versa-4-Copper-Rose-Aluminum-Pink-Sand-Strap-Fitness-Smartwatch-24mm-FB523RGRWUS/p/182319.htmlRead 7 October 2026Exact FB523RGRW-US Pink Sand / Copper Rose Aluminum listing identifies 810073611481. Regional identifiers are not exchanged.19Retailer pagephotopoint.ee/en/sports-watches/3626308-fitbit-versa-4-smart-watch-nfc-gps-satellite-amoled-touchscreen-heart-rate-monitor-activityRead 7 October 2026Exact FB523RGRD Beet Juice / Copper Rose Aluminum listing identifies 810038858746. Regional identifiers are not exchanged.

AnnouncediThe maker's first announcement of this model. This is separate from first retail availability.

24 August 20224Press releaseblog.google/products-and-platforms/devices/fitbit/versa-4-sense-2Read 23 October 2026Blog post dated Aug 24, 2022. Pre-orders started that day with worldwide availability that fall.

24 August 20223Press releaseblog.google/products-and-platforms/devices/fitbit/versa-4-sense-2Read 6 October 2026Fitbit blog post dated Aug 24, 2022. Pre-orders started that day with worldwide availability this fall.

Status

Available2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026The Google Store sells Sense 2 at 249.95 USD on the access date. That is a current price, not the launch price.

Available2Maker product pagestore.google.com/us/product/fitbit_versa_4_specsRead 7 October 2026Google Store sells Versa 4 at 199.95 USD on the access date. That is a current price, not the launch price.

PredecessoriThe model this one directly replaced, in the same line, tier and size, as the maker or a trusted review names it.

Not available

Not available

SuccessoriThe model that directly replaced this one, in the same line, tier and size. A revision such as a Slim or OLED model does not count when a next generation exists.

Not available

Not available

Launch price (US)iThe maker's US launch MSRP for the stated configuration, excluding tax. Current store prices and later discounts do not qualify.

$299.954Press releaseblog.google/products-and-platforms/devices/fitbit/versa-4-sense-2Read 23 October 2026Versa 4 is available for $229.95 and Sense 2 is available for $299.95 (USD). US prices exclude sales tax.

$229.954Press releaseblog.google/products-and-platforms/devices/fitbit/fitbit-sense-2-versa-4Read 6 October 2026Versa 4 is now available for $229.95 (USD). The Aug 24, 2022 announcement gives the same price. No euro launch price was found in a maker source.

Launch price (EU)iThe maker's euro launch price for the stated configuration, including VAT as published. Current store prices and later discounts do not qualify.

€299.9514Spec databasenextpit.de/smartwatches/google-fitbit-sense-2Read 23 October 2026UVP 299,95 EUR, marketed from September 2022.15Press articlepcwelt.de/article/1206707/fitbit-sense-2-vorgestellt-hier-finden-sie-alle-infos.htmlRead 23 October 2026PC-Welt (Germany) at the launch: Die Fitbit Sense 2 kostet 299,95 Euro. German prices include VAT. Tech Advisor states EUR 299.95, GBP 269.99 and USD 299.95.

Not available

MarketsiISO country or region codes where this exact model or variant is sold. A source page's language does not establish availability.

US, GB, DE, AU2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026US, GB, DE and AU Google Stores offer the model with a Buy button. Current prices are not launch prices.

US, GB, DE, EE2Maker product pagestore.google.com/us/product/fitbit_versa_4_specsRead 7 October 2026US, GB and DE maker stores offer the model. EE is a documented archived Beet retail listing, not a current-stock assertion.10Maker product pagestore.google.com/gb/product/fitbit_versa_4_specsRead 7 October 2026GB store offers Versa 4 at GBP 179.99 with Buy and all four colours. Current price is not a launch price.11Maker product pagestore.google.com/de/product/fitbit_versa_4_specsRead 7 October 2026DE store offers Versa 4 at EUR 199.95 with Kaufen and all four colours. Current price is not a launch price.19Retailer pagephotopoint.ee/en/sports-watches/3626308-fitbit-versa-4-smart-watch-nfc-gps-satellite-amoled-touchscreen-heart-rate-monitor-activityRead 7 October 2026Exact Beet FB523RGRD SKU was listed by Estonian retailer with Estonia delivery. Listing is now archived. This documents historical market scope rather than current stock.

ColoursiThe maker's own colour names

Shadow Grey / Graphite Aluminum, Lunar White / Platinum Aluminum, Blue Mist / Soft Gold Aluminum2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Colors: Shadow Grey / Graphite Aluminum, Lunar White / Platinum Aluminum, Blue Mist / Soft Gold Aluminum.

Black / Graphite Aluminum, Waterfall Blue / Platinum Aluminum, Pink Sand / Copper Rose Aluminum, Beet Juice / Copper Rose Aluminum2Maker product pagestore.google.com/us/product/fitbit_versa_4_specsRead 7 October 2026

Segment

Smartwatch2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Page title: Fitbit Sense 2 Smartwatch. The Aug 24, 2022 Fitbit blog calls it a health-focused smartwatch.

Smartwatch2Maker product pagestore.google.com/us/product/fitbit_versa_4_specsRead 7 October 2026Page title: Fitbit Versa 4 Smartwatch. The Aug 24, 2022 Fitbit blog calls it a fitness smartwatch.

OS updates promisediYears of explicitly promised OS updates. A security-only support period does not establish an OS-upgrade promise.

Not available

Not available

Security updates untiliExact end date published for security-update support of this model. Do not calculate it from a stated number of years. A security-only period does not promise OS upgrades.

Not available

Not available

Case

1 of 8 differ

Case sizeiMarketed case-size options. The marketed size can differ from physical case height, such as ceramic editions. Base dimensions describe the smallest base-material case.

Not available

Not available

Case shape

Rectangular14Spec databasenextpit.de/smartwatches/google-fitbit-sense-2Read 23 October 2026Gehäuseform: eckig (square).

Rectangular7Reviewtechradar.com/reviews/fitbit-versa-4Read 6 October 2026Design and display: a friendly-looking square-faced watch. The Google Store gives equal 40.5 mm length and width.

Case materialiMaterial of the housing body, not just the bezel. Use Mixed when the maker describes a mixture of housing/frame materials. Read the published-material field for the parts and proportions.

Aluminium1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Materials: the housing and buckle on Sense 2 are made of aluminum.14Spec databasenextpit.de/smartwatches/google-fitbit-sense-2Read 23 October 2026Gehäusematerial: Aluminium.

Aluminium1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Materials: The housing and buckle on Versa 4 are made of aluminum.

Case material (as published)

Aluminum1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Materials: the housing is aluminum. The store names the finishes Graphite, Platinum and Soft Gold Aluminum.

Aluminum1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026

BackiMaterial of the back of the smallest base-material case. Other materials or regional editions can differ. See source notes.

Not available

Plastic7Reviewtechradar.com/reviews/fitbit-versa-4Read 6 October 2026Design and display: the bezel is aluminum and the rear is plastic. Fitbit publishes no back material.

Case dimensionsiPhysical case height, width and thickness. The source note states exclusions such as the heart-rate sensor protrusion.

Height40.5Width40.5Thickness11.2mm(1.6 × 1.6 × 0.4 in)2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Dimensions and weight: length 40.5 mm, width 40.5 mm, height 11.2 mm. The page states no sensor exclusion. The same page states weight 37.64 g without saying whether the band is included, so no weight is stored.

Height40.5Width40.5Thickness11.2mm(1.6 × 1.6 × 0.4 in)2Maker product pagestore.google.com/us/product/fitbit_versa_4_specsRead 7 October 2026Dimensions and weight: Length 40.5 mm, Width 40.5 mm, Height 11.2 mm. Height is stored as thickness. The listed weight of 37.64 g does not say whether it includes the band, so neither weight field is filled.

Weight (case only)iWatch body without a strap. An unqualified published weight must not be assumed to exclude the strap.

Not available

Not available

Weight with strapiWatch with the stated strap attached. Strap material and case size belong in the source note. Reviewer measurements belong in measured fields.

Not available

Not available

Durability

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Water resistanceiStatic water-pressure rating in atmospheres. It is not a safe swimming or diving depth. Diving limits are listed separately.

5ATM2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Water resistance: water resistant to 50 m. The Google compare page states 5 ATM.9Maker product pagestore.google.com/gb/magazine/google_pixel_watch_compareRead 23 October 2026Maker comparison, Water and dust resistance row: Sense 2 5 ATM.

5ATM1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Environmental conditions: Water resistant up to 50 meters. Fitbit publishes no ATM figure. 50 m equals the 5 ATM static pressure rating.12Maker product pagestore.google.com/gb/magazine/google_pixel_watch_compareRead 7 October 2026Maker comparison explicitly publishes 5 ATM for Versa 4. The existing value is now directly maker-supported, without deriving pressure from metres.

Water resistance standard

IEC 605291Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026IP Rating, printed page 78: Model FB521 has a water resistance rating of IPX8 under IEC 60529, up to a depth of 50 meters. IEC 60529 covers ingress, so no ISO pressure standard is inferred.

IEC 605291Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Manual printed page 74 explicitly rates FB523 IPX8 under IEC 60529 up to 50 metres. IEC 60529 applies to water ingress, not an inferred ISO pressure or diving test. Maker comparison independently publishes 5 ATM.

Dust and water rating

IP6X, IPX81Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026IP Rating: IPX8 under IEC 60529 up to 50 m, and IP6X dust-tight. Stored as the two published codes.

IP6X, IPX81Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026IP Rating section: IPX8 under IEC 60529 up to a depth of 50 meters, and IP6X dust-tight. Stored as the two published codes.

Dive rating

Not available

Not available

Max dive depthiMaker-rated depth for the stated diving use, not a conversion from the water-resistance pressure rating.

Not available

Not available

MIL-STD-810iMaker claim that the watch was tested against specified MIL-STD-810 methods. It is not a guarantee for every military-standard test.

Not available

Not available

MIL-STD-810 tests

Not available

Not available

Operating temperatureiPublished operating range. Source notes identify on-wrist limits and other operating conditions. Storage or charging limits are excluded.

Min-10Max45°C1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Environmental conditions, printed page 63: operating temperature 14 to 113 F (-10 to 45 C). Non-operating and charging ranges (0 to 35 C) are not stored.

Min-10Max45°C1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Environmental conditions table: operating temperature 14 to 113 F (-10 to 45 C). Non-operating and charging (0 to 35 C) ranges excluded. The Google Store specs page prints -14 to 113 F, which conflicts. The manual table, which states both units, is used.

Display

2 of 14 differ

Display type

OLED2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Display: AMOLED display.

OLED2Maker product pagestore.google.com/us/product/fitbit_versa_4_specsRead 7 October 2026

Display type (as published)

AMOLED2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Display: AMOLED display.

AMOLED2Maker product pagestore.google.com/us/product/fitbit_versa_4_specsRead 7 October 2026Display: AMOLED display, Corning Gorilla Glass 3.

Screen sizeiPublished active display diagonal for a rectangular display, or diameter for a round display. Do not calculate it from pixels or display area.

1.58in(4 cm)12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Display size 1.58 inch. Notebookcheck and nextpit state the same. Fitbit publishes no diagonal.14Spec databasenextpit.de/smartwatches/google-fitbit-sense-2Read 23 October 2026Displaygröße: 1,58 Zoll.

1.58in(4 cm)6Reviewpcmag.com/reviews/fitbit-versa-4Read 6 October 2026Both feature a 1.58-inch AMOLED display (Versa 4 and Sense 2). Fitbit publishes no diagonal. Android Central, Trusted Reviews and Stuff state the same 1.58 inches.

Resolution

336 × 336px12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Display resolution 336 x 336 pixels. Notebookcheck states the same.

336 × 336px6Reviewpcmag.com/reviews/fitbit-versa-4Read 6 October 2026The 336-by-336-pixel display. TechRadar and Android Central state 336 x 336 as well. No pixel density is stored because none is published.7Reviewtechradar.com/reviews/fitbit-versa-4Read 6 October 2026The screen is a 336 x 336 pixel OLED just like the Versa 3's.

Pixel densityiPublished pixel density. A rectangular diagonal formula must not be applied to a round display.

Not available

Not available

Display area

Not available

Not available

Touchscreen

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Navigate Sense 2: color AMOLED touchscreen display and 1 button.

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Navigate Versa 4: Versa 4 has a color AMOLED touchscreen display and 1 button.

Max refresh rateiHighest published display refresh rate in active operation.

60Hz18Measurementnotebookcheck.net/Fitbit-Sense-2-Smartwatch-review-Automatic-activity-recording.717608.0.htmlRead 23 October 2026Notebookcheck spec box lists 60 Hz. Fitbit publishes no refresh rate. Treated as a stated spec, not a measurement.

Not available

Min refresh rateiLowest published display refresh rate, usually in always-on mode. It is not the active-use minimum unless stated.

Not available

Not available

Peak brightnessiMaker peak-brightness claim. It may apply to a small area or bright ambient light. Full-screen limits and battery/temperature conditions belong in source notes.

1,000nits12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Display brightness: Up to 1,000 nits. Fitbit publishes no nit figure in the documents read, so this is a spec database claim. Window size and ambient conditions are not stated.

Not available

Minimum brightness

Not available

Not available

Always-on display

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Adjust always-on display section. The setting reduces battery life.3Maker product pagestore.google.com/us/product/fitbit_sense_2Read 23 October 2026Always-on display mode: keeps your display on at all times (may require more frequent charging).

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Adjust always-on display section.

Display cover

Gorilla Glass2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Display: Corning Gorilla Glass 3.

Gorilla Glass2Maker product pagestore.google.com/us/product/fitbit_versa_4_specsRead 7 October 2026

Display cover (as published)

Corning Gorilla Glass 32Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Display: Corning Gorilla Glass 3.

Corning Gorilla Glass 32Maker product pagestore.google.com/us/product/fitbit_versa_4_specsRead 7 October 2026

Platform

4 of 15 differ

Platform

Proprietary2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026No OS name is printed on the spec page. The Fitbit blog says the watch is powered by the new Fitbit OS, a proprietary platform with its own Gallery.

Proprietary3Press releaseblog.google/products-and-platforms/devices/fitbit/versa-4-sense-2Read 6 October 2026

OS at launch

Fitbit OS4Press releaseblog.google/products-and-platforms/devices/fitbit/versa-4-sense-2Read 23 October 2026Powered by the new Fitbit OS. No version number is published.

Fitbit OS3Press releaseblog.google/products-and-platforms/devices/fitbit/versa-4-sense-2Read 6 October 2026Powered by the new Fitbit OS. No version number is published.

Software

Not available

Not available

Latest OS

Fitbit OS, firmware 220.317Maker product pagesupport.google.com/googlehealth/answer/14236725Read 23 October 2026Fitbit firmware release notes: Sense 2 latest listed version 220.31 (bug fixes and improvements) on the access date. No Fitbit OS major version number is published.

Fitbit OS, firmware 220.3113Maker product pagesupport.google.com/googlehealth/answer/14236725Read 7 October 2026Latest maker-listed Versa 4 device firmware on access date. No unreported Fitbit OS major version is assigned. Updates are phased.

Works with

iOS, Android2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Requirements: Apple iOS 16.4 or higher, Android OS 11.0 or higher, current on the access date.

iOS, Android2Maker product pagestore.google.com/us/product/fitbit_versa_4_specsRead 7 October 2026

Phone requirement

Google Health app on a compatible device running Apple iOS 16.4 or higher or Android OS 11.0 or higher2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Requirements: the Google Health app on a device running Apple iOS 16.4 or higher or Android OS 11.0 or higher. This is the current requirement. The 2022 launch requirement may have been lower.

Google Health app on a compatible device running Apple iOS 16.4 or higher or Android OS 11.0 or higher2Maker product pagestore.google.com/us/product/fitbit_versa_4_specsRead 7 October 2026Requirements section, current on the access date. The 2022 launch requirement may have been lower.

App store

No1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026The Fitbit Gallery offers Fitbit apps and clock faces. Tom's Guide states third-party apps cannot be downloaded.17Reviewtomsguide.com/news/fitbit-sense-2Read 23 October 2026Review: you don't get access to third-party apps. You can download custom watch faces but not third-party apps. The Sense 2 and Versa 4 cannot.

No6Reviewpcmag.com/reviews/fitbit-versa-4Read 6 October 2026The Versa 4 does not support third-party app downloads, with the exception of watch faces.

Voice assistants

Amazon Alexa1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Voice Assistant: Amazon Alexa Built-in. Needs the phone app running in the background. Not available in all countries.3Maker product pagestore.google.com/us/product/fitbit_sense_2Read 23 October 2026Smarts and more: Alexa Built-in.

Amazon Alexa1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Voice Assistant: Amazon Alexa Built-in. Needs the phone app running in the background. Not available in all countries.

Chipset

Ambiq Apollo4 Plus12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Platform: Ambiq Apollo4 Plus, ARM Cortex-M4 at 96-192 MHz. Fitbit publishes no chip and Notebookcheck says it does not disclose the SiP. Ambiq's own presentation says Apollo4 powers the Sense product line, which supports the chip family but not the Plus suffix.16Press articleambiq.com/wp-content/uploads/2022/12/Key-to-the-Future-of-Electronics.pdfRead 23 October 2026Ambiq presentation: Apollo4 powers Inspire, Versa and Sense product lines of Fitbit, and Versa 4, Sense 2 and Inspire 3 were launched in August 2022.

Not available

Process

Not available

Not available

CPU cores

112Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Same Platform entry: one ARM Cortex-M4 core.

Not available

CPU configuration

AFitbit Sense 2

Count	Core	Max clock (GHz)
1	Arm Cortex-M4	0.192

Source12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Same Platform entry: ARM Cortex-M4 at 96-192 MHz. 192 MHz is stored as the maximum.

BFitbit Versa 4

Not available

Max CPU clock

0.192GHz=CalculatedFrom CPU configuration

Not available

GPU

Not available

Not available

Low-power coprocessor

Not available

Not available

Memory

2 of 2 differ

RAMiKeep published GB values as stated. Convert a source explicitly labelled MB using 1000 MB per GB and preserve its original figure and unit in the note. Do not assume MB means MiB. Convert explicit MiB or GiB to decimal GB through their byte definitions, recording the conversion in the note. This normalization does not establish an exact physical byte count.

2.75 MB12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Same entry: 2.75 MB on-chip SRAM, stored as 0.00275 GB with 1000 MB per GB. No maker figure exists.

Not available

StorageiTotal built-in storage the maker states, in decimal GB. Space available to the user is lower and goes in the source note. A figure the maker gives only as available space is not stored.

4GB18Measurementnotebookcheck.net/Fitbit-Sense-2-Smartwatch-review-Automatic-activity-recording.717608.0.htmlRead 23 October 2026Performance and runtime: the manufacturer has installed 4 GB of internal storage, usable for apps and watch faces. Fitbit publishes no storage figure. Routes and music cannot be stored.

Not available

Health sensors

4 of 8 differ

Heart rate sensor

Multi-path optical heart rate sensor1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Sensors and Components: multi-path optical heart rate tracker. The Google Store spells it Multi-path optical heart rate sensor.2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Sensors and components: multi-path optical heart rate sensor.

Multi-path optical heart rate sensor1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Sensors and Components: Multi-path optical heart rate tracker. Google Store spells it Multi-path optical heart rate sensor.

ECG capabilityiElectrical heart sensing hardware with an ECG capability. The ECG app can require an eligible country, age and paired phone.

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Sensors and Components: multipurpose electrical sensors compatible with the ECG app and EDA Scan app. The ECG app is not available in all countries.2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Sensors: multipurpose electrical sensors compatible with ECG app and EDA app. ECG not available in all countries.

No4Press releaseblog.google/products-and-platforms/devices/fitbit/fitbit-sense-2-versa-4Read 6 October 2026The ECG app is named for Sense 2 only, while Irregular Heart Rhythm Notifications are on both watches. Versa 4 has no electrical heart sensor in its sensor list.6Reviewpcmag.com/reviews/fitbit-versa-4Read 6 October 2026The Sense 2 adds an electrocardiogram (ECG) sensor.

Blood oxygen sensingiBlood-oxygen sensing capability. App availability and medical status vary by market.

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Sensors and Components: red and infrared sensors for oxygen saturation (SpO2) monitoring.

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Sensors and Components: red and infrared sensors for oxygen saturation (SpO2) monitoring. Not available in all countries and not for medical use.

Skin temperature sensingiA sensor or supported function that measures skin temperature. It is not a core-body thermometer.

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Sensors and Components: on-wrist skin temperature sensor. Track your skin temperature changes: nightly variation from a personal baseline. Not available in all markets.

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Track your sleep and Advanced health metrics: skin temperature variation from personal baseline. It reports variation only, not an absolute temperature.2Maker product pagestore.google.com/us/product/fitbit_versa_4_specsRead 7 October 2026Sensors and components: Device temperature sensor (skin temperature variation available in the Google Health app). Variation only, not in all markets.

Blood pressure featureiPublished blood-pressure feature category. Hypertension notifications are not numerical blood-pressure readings.

None12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Blood pressure: No. The maker sensor list and feature pages have no blood-pressure feature.

None14Spec databasegadgetsandwearables.com/technical-specs/fitbit-versa-4Read 7 October 2026Explicit absence of blood-pressure feature. Maker comparison also lacks blood-pressure trends.

Body composition sensor

No1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026The complete sensor list in Sensors and Components has no bioelectrical impedance sensor.12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Body composition: No.

Not available

Skin conductance (EDA)

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Sensors and Components: electrical sensor to measure skin conductance (cEDA) for stress detection. Manage stress: continuous EDA identifies body responses.4Press releaseblog.google/products-and-platforms/devices/fitbit/versa-4-sense-2Read 23 October 2026Sense 2 has a new Body Response sensor for continuous electrodermal activity (cEDA).

No3Press releaseblog.google/products-and-platforms/devices/fitbit/versa-4-sense-2Read 6 October 2026The continuous EDA (cEDA) Body Response sensor is described for Sense 2 only. Versa 4 has no EDA sensor in its own sensor list.6Reviewpcmag.com/reviews/fitbit-versa-4Read 6 October 2026The Sense 2 adds a cEDA sensor and an ECG sensor that the Versa 4 lacks.

Medical clearancesiNamed regulatory clearances and their jurisdiction. General water resistance or an ECG sensor does not establish medical clearance.

ECG app: FDA clearance, ECG app: EU clearance, Irregular Heart Rhythm Notifications: FDA clearance, Irregular Heart Rhythm Notifications: EU clearance3Maker product pagestore.google.com/us/product/fitbit_sense_2Read 23 October 2026Heart section: the ECG app assesses heart rhythm for atrial fibrillation. Clearance wording is in the Fitbit blog.5Press releaseblog.google/products-and-platforms/devices/fitbit/fitbit-sense-2-versa-4Read 23 October 2026Footnote and text: the ECG app on Sense 2 and the Irregular Heart Rhythm Notifications on both watches have FDA and EU clearance. Only in select countries, not for people under 22 or with known atrial fibrillation.

Irregular Heart Rhythm Notifications: FDA clearance, Irregular Heart Rhythm Notifications: EU clearance4Press releaseblog.google/products-and-platforms/devices/fitbit/fitbit-sense-2-versa-4Read 6 October 2026Both of these tools have FDA and EU clearance: the Sense 2 ECG app and the Irregular Heart Rhythm Notifications on both watches. Select countries only, not for people under 22 or with known AFib.

Motion and environment sensors

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Accelerometer

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Sensors and Components: 3-axis accelerometer.2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Sensors and components: 3-axis accelerometer.

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026

Accelerometer range

Not available

Not available

Gyroscope

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Sensors and Components: gyroscope.

No12Maker product pagestore.google.com/gb/magazine/google_pixel_watch_compareRead 7 October 2026Versa 4 column explicitly lacks the gyroscope.

Barometric altimeter

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Sensors and Components: altimeter, which tracks altitude changes.

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Sensors and Components: Altimeter, which tracks altitude changes. Restart section names a small hole on the device for the altimeter, which is the pressure-sensor vent. Published only as Altimeter.

Compass

No1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026The complete sensor list in Sensors and Components has no compass or magnetometer. Gadgets & Wearables also lists Compass: No.12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Compass: No. Geomagnetic: No.

No12Maker product pagestore.google.com/gb/magazine/google_pixel_watch_compareRead 7 October 2026Versa 4 column explicitly lacks the compass.

Ambient light sensor

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Sensors and Components: ambient light sensor.

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026

Depth gauge

Not available

Not available

Depth gauge rangeiPublished measurement range of the depth gauge, distinct from maximum diving depth and water-pressure resistance.

Not available

Not available

Water temperature sensor

Not available

Not available

Health and fitness

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Health featuresiSupported health functions with country, phone and subscription restrictions in the source notes. Upcoming functions are not counted as available.

Continuous heart rate, Heart rate alerts, Irregular rhythm notifications, ECG app, Blood oxygen app, Heart rate variability, Sleep tracking, Sleep stages, Stress tracking, Readiness score, Cycle tracking1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Today and sleep sections: sleep stages (REM, light, deep) and sleep score, stress management score, readiness score (Premium), menstrual health tile, high and low heart rate notifications after 10 inactive minutes, heart-rate variability under Advanced health metrics, oxygen saturation. Daily readiness score needs Fitbit Premium. Irregular rhythm notifications and the ECG app come from the Fitbit blog.3Maker product pagestore.google.com/us/product/fitbit_sense_2Read 23 October 2026Heart rate tracking, high and low heart rate notifications, irregular heart rhythm notifications, ECG app, HRV, breathing rate, SpO2, sleep tracking and sleep stages, Stress Management Score, Daily Readiness Score, menstrual health tracking. The Daily Readiness Score is a Premium feature in the manual.

Continuous heart rate, Heart rate alerts, Irregular rhythm notifications, Blood oxygen app, Heart rate variability, Sleep tracking, Sleep stages, Stress tracking, Readiness score, Cycle tracking1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Today app stats: heart rate, oxygen saturation, readiness, stress management score, menstrual health. Track your sleep: sleep stages. Receive heart-rate notifications: high and low heart rate. Advanced health metrics: heart-rate variability. Daily readiness and some detail need Fitbit Premium per the maker blog.3Press releaseblog.google/products-and-platforms/devices/fitbit/versa-4-sense-2Read 6 October 202624/7 heart rate monitoring, sleep tracking and Stress Management Score.4Press releaseblog.google/products-and-platforms/devices/fitbit/fitbit-sense-2-versa-4Read 6 October 2026Irregular Heart Rhythm Notifications on both watches.

Fitness featuresiSupported workout functions. A sport-profile name alone does not prove advanced metrics such as running power or running dynamics. Trackback follows the recorded route back to the start. A compass arrow that points straight to the start does not count.

Automatic workout detection, VO2 max, Pool swim, Interval workouts, Turn-by-turn navigation1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Exercise settings list Pool Length, Interval, Auto Start and Auto-Stop. Track your exercise automatically (SmartTrack, 15 minute minimum). Google Maps gives turn-by-turn directions and needs the paired phone nearby with the app running. View your cardio fitness score (stored as vo2_max, see the Google Health VO2 max help page).3Maker product pagestore.google.com/us/product/fitbit_sense_2Read 23 October 2026Fitness features: Cardio Fitness Score estimated from VO2 max, SmartTrack Automatic Exercise Recognition (in app only), Google Maps turn-by-turn directions.11Maker product pagesupport.google.com/googlehealth/answer/14237924Read 23 October 2026Learn about your VO2 max: VO2 max, formerly the cardio fitness score, is estimated during outdoor runs with GPS. The Sense 2 manual names the cardio fitness score.

Automatic workout detection, VO2 max, Pool swim, Interval workouts, Turn-by-turn navigation1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Track your exercise automatically (SmartTrack, 15 minute minimum). Exercise settings list Pool Length and Interval. Google Maps app gives turn-by-turn directions and needs the paired phone nearby with the app running. View your cardio fitness score in the Fitbit app (stored as vo2_max, see the Google Health VO2 max help page).9Maker product pagesupport.google.com/googlehealth/answer/14237924Read 6 October 2026Learn about your VO2 max: tap VO2 max (formerly known as cardio fitness score). The Versa 4 manual names the cardio fitness score. VO2 max is estimated during outdoor runs with GPS.

Sport profilesiPublished count of distinct sport/activity profiles. A claim such as 180+ is not an exact integer count.

Not available

Not available

Dive modesiActual supported dive modes. Water resistance or a depth app alone does not establish decompression-capable scuba support.

Not available

Not available

External sensorsiTypes of external workout sensors the watch can pair with. GPS reception, phone data and built-in sensors do not qualify.

Not available

Not available

Safety

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Fall detectioniAutomatic fall detection. Incident detection restricted to recorded workouts is not counted as general fall detection.

No9Maker product pagestore.google.com/gb/magazine/google_pixel_watch_compareRead 23 October 2026Safety and emergency rows (Safety Check, Emergency Sharing, Medical information, Fall Detection, Emergency SOS, Emergency international calling, Car Crash Detection, Earthquake Alerts): the Sense 2 column is empty for all of them. No fall detection.

No12Maker product pagestore.google.com/gb/magazine/google_pixel_watch_compareRead 7 October 2026Versa 4 column explicitly lacks general fall detection.

Car crash detection

No9Maker product pagestore.google.com/gb/magazine/google_pixel_watch_compareRead 23 October 2026Same Safety rows: Car Crash Detection is empty in the Sense 2 column.

No12Maker product pagestore.google.com/gb/magazine/google_pixel_watch_compareRead 7 October 2026Versa 4 column explicitly lacks car crash detection.

Emergency SOSiA manual emergency alert to emergency services or preset contacts. Source notes identify the recipient, paired-phone requirement and country limits. Satellite is listed separately.

No9Maker product pagestore.google.com/gb/magazine/google_pixel_watch_compareRead 23 October 2026Same Safety rows: Emergency SOS is empty in the Sense 2 column.

No12Maker product pagestore.google.com/gb/magazine/google_pixel_watch_compareRead 7 October 2026Versa 4 column explicitly lacks manual emergency SOS.

Emergency sireniPublished or measured siren sound level in decibels. Audible distance alone does not establish this value. Measurement distance belongs in source notes.

Not available

Not available

Live location sharingiShares live location during supported use. A paired phone or data subscription may be required.

Not available

Not available

Dedicated LED flashlightiA dedicated hardware LED flashlight. Lighting the display white is not counted.

No9Maker product pagestore.google.com/gb/magazine/google_pixel_watch_compareRead 23 October 2026No flashlight appears in the Sense 2 sensor and component list. Gadgets & Wearables states Flashlight: No.12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Flashlight: No.

No14Spec databasegadgetsandwearables.com/technical-specs/fitbit-versa-4Read 7 October 2026Explicit absence of dedicated LED flashlight. Display illumination is not that hardware feature.

Positioning

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PositioningiPublished satellite systems and signal bands. Do not infer bands from dual-frequency support alone.

GPS, GLONASS1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Sensors and Components: built-in GPS receiver + GLONASS. Dynamic GPS can use the phone's GPS instead to save battery. No band or dual-frequency claim.4Press releaseblog.google/products-and-platforms/devices/fitbit/versa-4-sense-2Read 23 October 2026Built-in GPS is named for Sense 2.

GPS, GLONASS1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Sensors and Components: Built-in GPS receiver + GLONASS. Dynamic GPS can use the phone's GPS instead to save battery. No band or dual-frequency claim.

Dual-band GNSSiMaker-stated dual-frequency satellite reception. Supported constellations and signal bands are listed separately.

Not available

Not available

Offline mapsiMap data stored on the watch and usable without live phone data. GPX routes or breadcrumb tracks alone are not offline maps.

No12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Offline maps: No. The manual requires the phone and background app for Google Maps.

No14Spec databasegadgetsandwearables.com/technical-specs/fitbit-versa-4Read 7 October 2026Explicit no offline maps. Maker manual requires phone navigation and background app. Directions are not stored cartographic maps.

Connectivity

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BluetoothiPublished Bluetooth support for this model. The version is recorded separately. Unknown version does not mean the radio is absent.

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Wireless technology: Bluetooth 5.0 radio transceiver and NFC chip.

Not available

Bluetooth version

5.01Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Wireless technology, printed page 62: Bluetooth 5.0 radio transceiver and NFC chip.14Spec databasenextpit.de/smartwatches/google-fitbit-sense-2Read 23 October 2026Bluetooth: 5.

5.01Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Wireless technology: Bluetooth 5.0 radio transceiver and NFC chip. Wi-Fi hardware is listed as deactivated and cannot be turned on, so no Wi-Fi standard is stored.

Wi-FiiPublished Wi-Fi support for this model. The standard and bands are recorded separately. Unknown standard does not mean Wi-Fi is absent.

No1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Sensors and Components: WiFi (deactivated, cannot be turned on). Stored as false because the user cannot use it. No Wi-Fi standard is stored.

Not available

Wi-Fi standard

Not available

Not available

Wi-Fi bands

Not available

Not available

CellulariTrue when a cellular edition is sold. A variant row states whether that individual model has cellular hardware.

No1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026No cellular radio is listed in Wireless technology (Bluetooth and NFC only).

No8Reviewtomsguide.com/reviews/fitbit-versa-4Read 7 October 2026Fitbit's watches don't have cellular support. Only one radio configuration (FB523, Bluetooth and NFC) exists in the manual.

Network

Not available

Not available

4G bandsiPublished LTE bands for the stated regional cellular model. Do not transfer bands to another region or Wi-Fi-only model.

Not available

Not available

5G bandsiPublished 5G NR bands for the stated regional cellular model. RedCap support does not establish conventional full-bandwidth phone 5G.

Not available

Not available

NFCiSome regions sell an NFC edition, so it is per variant.

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Wireless technology: NFC chip. Contactless Payments section describes the built-in NFC chip.

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026

Contactless payments

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Contactless Payments: set up Google Wallet in the Fitbit app and pay at contactless terminals.3Maker product pagestore.google.com/us/product/fitbit_sense_2Read 23 October 2026Smarts and more: Google Wallet, make purchases from your wrist everywhere Google Pay is accepted.

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026

Payment services

Google Wallet1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Contactless Payments: Google Wallet. The text also names Fitbit Pay for the older service name.

Google Wallet1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Contactless Payments: set up Google Wallet in the app. The manual also names the legacy Fitbit Pay app, which Google is phasing out. Card, bank and country limits apply.

Ultra-wideband

No1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Wireless technology lists only a Bluetooth radio and an NFC chip. No UWB radio.

No12Maker product pagestore.google.com/gb/magazine/google_pixel_watch_compareRead 7 October 2026Versa 4 column explicitly lacks UWB radio.

Satellite

None9Maker product pagestore.google.com/gb/magazine/google_pixel_watch_compareRead 23 October 2026No satellite feature in any Safety row. Published radios are Bluetooth and NFC. GPS reception is separate.

None12Maker product pagestore.google.com/gb/magazine/google_pixel_watch_compareRead 7 October 2026No satellite SOS. Published transmitters are Bluetooth/NFC. GPS reception is separate.

ANT+

Not available

Not available

Audio

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Speaker

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Sensors and Components lists Speaker and Microphone. The Google Store rates the speaker at 75 dB SPL at 10 cm. That is not an emergency siren.

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Sensors and Components lists Speaker and Microphone. The Google Store rates the speaker at 75 dB SPL at 10 cm. That is not an emergency siren.

Microphones

Not available

Not available

Calls on the watchiVoice-call capability of the marketed model, including sold cellular editions. Variant radio capability and paired-phone requirements still apply.

Phone only1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Answer or reject phone calls and Take on-wrist phone calls: calls go through the paired iPhone or Android phone, which must be nearby with the Fitbit app running. No cellular model exists.

Phone only1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Answer or reject phone calls: on-wrist calls through the paired iPhone or Android phone, which must be nearby with the Fitbit app running. No cellular model exists.

Music on the watchiPlays audio stored on the watch. Remote control of phone playback or streaming alone does not qualify.

No12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026On-board music storage: No. Smartphone music control only.

No7Reviewtechradar.com/reviews/fitbit-versa-4Read 6 October 2026You can't store music on the watch. Tom's Guide also says you can't download music to the Versa 4.8Reviewtomsguide.com/reviews/fitbit-versa-4Read 7 October 2026You can't download music to the Versa 4 or install third-party apps.

Controls

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ButtonsiPhysical controls used to operate the watch, excluding the rotating crown and strap-release buttons. A clickable rotating crown is counted only in Crown.

11Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Navigate Sense 2: color AMOLED touchscreen display and 1 button.

11Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Navigate Versa 4: color AMOLED touchscreen display and 1 button.

Named operating buttonsiNames of operating buttons, excluding the crown and strap-release controls.

Button1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Navigate Sense 2: the single button opens the apps menu, returns to the clock face and has long-press and double-press shortcuts.

Button1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Maker calls the single operating control Button. Strap-release latches are excluded.

CrowniA crown that rotates to control the interface. A round push button that does not rotate is not a crown.

None1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Navigate Sense 2 describes only the touchscreen and 1 button. No crown.

None1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026The controls are the touchscreen and 1 button. There is no rotating crown.

Rotating bezeliPhysical rotation or touch gestures around the display edge. A fixed decorative bezel is None.

None1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Navigate Sense 2 describes only the touchscreen and 1 button. No bezel control.

Not available

Gestures

Turn your wrist, Briefly cover the watch face with your opposite hand, Triple-tap the screen1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Screen wake setting: Button & motion turns the screen on when you turn your wrist. Turn off the screen: briefly cover the watch face with your opposite hand, except with always-on display. Screen Zoom: Magnify works on a triple-tap.

Turn your wrist, Briefly cover the watch face with your opposite hand, Triple-tap the screen1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Manual screen-wake setting documents selectable wrist-turn wake. Printed page 22 says briefly covering the face turns the screen off, except when always-on display is enabled. Printed page 20 says triple-tap zoom works after Magnify is enabled. These are interface gestures, not unsupported inertial sensor features.

Battery and charging

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Battery capacityiPublished battery capacity for the stated case size. Rated and typical capacity are distinguished in source notes.

162mAh12Spec databasegadgetsandwearables.com/technical-specs/fitbit-sense-2Read 23 October 2026Battery: rechargeable lithium-polymer battery, 162 mAh.13Retailer pageifixit.com/products/fitbit-sense-2-batteryRead 23 October 2026iFixit replacement battery listing for Sense 2: 0.62 Wh, 3.87 V, 162 mAh. 162 mAh x 3.87 V = 0.627 Wh, which agrees. It is a parts listing, not a teardown. Gadgets & Wearables, Notebookcheck and nextpit also state 162 mAh. Two Argos listings print 260 mAh, which is not used.14Spec databasenextpit.de/smartwatches/google-fitbit-sense-2Read 23 October 2026Batteriekapazität (Netto): 162 mAh.

Not available

Claimed battery lifeiMaker endurance claims with distinct operating modes and case sizes. With solar describes augmentation of that estimate, not hardware capability. Use false for ordinary claims without solar augmentation, true for explicitly solar-aided claims, and omit it when solar qualification is unclear. Source notes state AOD, GNSS, music and solar conditions. Do not create a normal-use row from an AOD-only claim. Low power denotes the maker battery-saver mode. Keep its typical, light-use and always-on claims separate from standard-mode claims. GPS power saving identifies an intermediate reduced-accuracy GNSS saving preset. Source notes retain the maker's preset name and published conditions. Max battery GPS is the distinct maximum-saving claim. When the maker has only one GPS saving preset, it is GPS power saving.

AFitbit Sense 2

Mode	With solar	Hours (h)
Smartwatch	No	144
Always-on	No	72
GPS	No	5

Source2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Battery and power: battery life of 6+ days, stored as 144 h as a minimum figure. Up to 5 hours with continuous GPS, stored as the gps row. The always-on display, SpO2 and cEDA sensor need more frequent charging. The Google Health support article states up to 12 hours with continuous GPS for Sense 2, a conflict. The model spec page is used because the Oct 2022 Fitbit.com page printed the same 5 hours.6Maker product pagesupport.google.com/googlehealth/answer/14226518Read 23 October 2026Estimated battery life table: Fitbit Sense 2 6+ days. Footnote: with always-on display, Sense 2 has a battery life of up to 3 days (stored as 72 h always_on). The same footnote says Sense 2 has up to 12 hours with continuous GPS, which conflicts with the 5 hours on the model spec page. The 12 hour figure is not stored.10Maker product pageweb.archive.org/web/20221022073607/https://www.fitbit.com/global/us/products/smartwatches/sense2Read 23 October 2026Archived Fitbit.com Sense 2 page, Oct 22, 2022: battery life of 6+ days and up to 5 hours with continuous GPS. Same wording as the current Google Store.

BFitbit Versa 4

Mode	With solar	Hours (h)
Smartwatch	No	144
Always-on	No	72
GPS	No	12

Source5Maker product pagesupport.google.com/googlehealth/answer/14226518Read 6 October 2026Battery life table: Fitbit Versa 4* 6+ days, stored as 144 h as a minimum figure. Footnote *: always-on display and GPS need more frequent charging. If you turn on always-on display: Versa 4 up to 3 days (72 h). If you use built-in GPS continuously: Versa 4 up to 12 hours. The 2025 pre-production test footnote (**) belongs to Google Fitbit Air, not Versa 4.

Smartwatch mode (claimed)iMaker normal-use smartwatch claim without solar. A watch with only an explicit AOD-mode claim has no value here. Workloads differ and source notes must be read.

144h=CalculatedFrom Claimed battery life

144h=CalculatedFrom Claimed battery life

AOD battery life (up to)iMaker claimed smartwatch endurance with the always-on display enabled and without solar, for the base case. Source notes preserve workload and case conditions. This is a claim, not a measured test or an AOD-off estimate.

72h=CalculatedFrom Claimed battery life

72h=CalculatedFrom Claimed battery life

GPS mode (claimed)iMaker regular GPS/GNSS activity claim without solar, for the base case. AOD, multi-band, music and power-saving conditions have separate rows when published.

5h=CalculatedFrom Claimed battery life

12h=CalculatedFrom Claimed battery life

Solar chargingiPublished solar charging hardware capability. An ordinary battery estimate without solar augmentation does not prove that the watch lacks solar charging hardware.

Not available

Not available

Charging methodiThe connection at the watch, not the cable end at the USB adapter. A proprietary inductive puck is not Qi unless interoperability is explicitly established.

Magnetic pins1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Charge your watch: hold the cable end near the port on the back until it attaches magnetically. The pins on the cable align with the port on the back.

Magnetic pins1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Charge your watch: the cable end attaches magnetically to the port on the back and its pins align with the port.

Charging guidanceiPublished charging requirements, nominal estimates and compatibility guidance. Keep adapter ratings separate from power accepted by the watch.

Not available

Not available

Max charging power (watch)iPublished maximum charging power at the watch. Adapter rating or charger input power does not prove the power accepted by the watch.

Not available

Not available

Fast chargingiAn explicit fast-charging capability claim. A short charging time or high adapter wattage alone does not qualify.

Yes5Press releaseblog.google/products-and-platforms/devices/fitbit/fitbit-sense-2-versa-4Read 23 October 2026Fast charging gets a full day's worth of battery in just 12 minutes.

Yes4Press releaseblog.google/products-and-platforms/devices/fitbit/fitbit-sense-2-versa-4Read 6 October 2026Fast charging gets you a full day's worth of battery in just 12 minutes.

Quick charge claimiMaker claim for usage from a short charge. Source notes identify the usage workload, such as normal use or sleep tracking.

Charge time12 minUse time24 h1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Charge your watch: charge Sense 2 for 12 minutes for 24 hours of battery life. The usage workload is not named.

Charge time12 minUse time24 h1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Charge Versa 4 for 12 minutes for 24 hours of battery life.

Charge 0 to 80% (claimed)iMaker claim for charging an empty battery to 80%. Charger and approximate qualifiers belong in source notes.

Not available

Not available

Full charge time (claimed)iMaker advertised nominal full-charge duration. Approximate or theoretical maker estimates are allowed, with their conditions in source notes. Partial-charge intervals do not qualify. Measured 0 to 100% tests have a separate field.

120min1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Charge your watch: charging fully takes about 1-2 hours. The Google Store spec page states two hours and is stored.2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026Battery and power: the Oct 2022 Fitbit.com spec text states charge time (0-100%): two hours.

120min2Maker product pagestore.google.com/us/product/fitbit_versa_4_specsRead 7 October 2026Battery and power: Charge time (0-100%): Two hours. The manual says charging fully takes about 1-2 hours.

Measured

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Peak brightness (measured)iReviewer measurement. Source notes state screen area, mode and ambient light. A small-area peak claim cannot be replaced with a full-screen measurement.

Not available

Not available

Battery life (measured)iReviewer-observed mixed-use endurance. Source notes state case size, AOD, workout use and whether it was a complete discharge. Extrapolation from partial discharge is excluded.

144h18Measurementnotebookcheck.net/Fitbit-Sense-2-Smartwatch-review-Automatic-activity-recording.717608.0.htmlRead 23 October 2026Battery life: with all measurements active, worn around the clock, automatic training detection on, no extensive workouts and the always-on display off, the Sense 2 lasts exactly six days (144 h). Firmware and brightness are not stated. The always-on display test (just under four days) has no exact figure and is not stored.

Not available

Battery tests (measured)iReviewer-observed endurance, with case size and test settings in source notes. Partial-discharge projections are not stored as measured endurance.

AFitbit Sense 2

Test	Hours (h)
Mixed use, always-on display off	144

Source18Measurementnotebookcheck.net/Fitbit-Sense-2-Smartwatch-review-Automatic-activity-recording.717608.0.htmlRead 23 October 2026Same test: always-on display off, all measurements active, automatic training detection, no extensive workouts. 6 days converted to 144 h. With the always-on display on it lasted just under four days, which is not stored as a number.

BFitbit Versa 4

Not available

Full charge time (measured)iReviewer measurement from empty to full, not 0-80% or a charge from 5%. Source notes name the charger and case size.

95min18Measurementnotebookcheck.net/Fitbit-Sense-2-Smartwatch-review-Automatic-activity-recording.717608.0.htmlRead 23 October 2026Battery life: 0 to 99 percent after 85 minutes on a 24-watt power supply and another 10 minutes for the last percent. Stored as 95 minutes for 0 to 100 percent. 0 to 80 percent took one hour. Test unit with the supplied charging cable and a 24 W adapter. The maker claims two hours.

60min8Reviewtomsguide.com/reviews/fitbit-versa-4Read 7 October 2026Reviewer observed depleted-to-full charging using the proprietary USB-A-ended charging arrangement. Standard 40.5 mm Copper Rose review unit. USB power adapter, ambient temperature and firmware are unstated. This is a measured result, separate from the maker two-hour claim. Partial-discharge runtime projections are not added.

Strap

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Lug widthiDistance between standard strap attachment lugs, not the decorative width of a proprietary strap. Unknown for custom connectors unless the maker publishes lug width.

24mm3Maker product pagestore.google.com/us/product/fitbit_sense_2Read 23 October 2026The store shows an accessory shop headed Shop 24mm attach accessories. Fitbit publishes no lug width in a spec table, and the connector is proprietary, so this is the maker's attach size only.18Measurementnotebookcheck.net/Fitbit-Sense-2-Smartwatch-review-Automatic-activity-recording.717608.0.htmlRead 23 October 2026Case and features: the strap is 24 millimeters wide and can be changed without tools. It is not a standard clasp, so 24 mm is the strap width, not a lug width for standard straps.

Not available

Quick-release strapiThe supplied strap can be detached through its quick-release mechanism. Compatibility with quick-release replacement straps alone does not qualify.

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Change the band: slide the flat latch button toward the band, pull the band away. Attach by pressing until it clicks. No tools.

Yes1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Change the band: slide the flat latch button toward the band and pull. Attach by pressing until it clicks. No tools.

Strap systemiPublished attachment system and compatible case sizes. Proprietary connectors are distinguished from standard spring bars.

Proprietary latch connector. Fitbit Sense, Versa 3 and Versa 4 bands are compatible.1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Change the band: Fitbit Sense, Fitbit Versa 3, and Fitbit Versa 4 bands are compatible with Sense 2. Band latches on the back. No lug width is stated in the manual.

Proprietary latch connector. Fitbit Sense, Sense 2 and Versa 3 bands are compatible.1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Change the band: Fitbit Sense, Fitbit Sense 2, and Fitbit Versa 3 bands are compatible with Versa 4. Turn over Versa 4 and find the band latches. Slide the flat button toward the band to release the latch. Proprietary connector, no lug width published.

Strap materialiMaterial of the supplied strap for the stated package. Do not substitute material from another band sold separately.

Other1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Materials: the supplied band is a flexible, durable elastomer similar to the material used in many sports watches. Other preserves that wording without guessing silicone, HNBR or fluoroelastomer.

Other1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Supplied classic band is elastomer. Other preserves that wording without guessing silicone, HNBR or fluoroelastomer.

Strap

Classic band2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026What's in the box: Classic band (Small and Large).

Classic band2Maker product pagestore.google.com/us/product/fitbit_versa_4_specsRead 7 October 2026Maker box lists Classic band in small and large sizes. Manual printed page 57 states flexible durable elastomer. band_material=other preserves that published material without guessing a specific polymer.

Strap sizesiPublished wrist-circumference range for the stated strap or case. Source notes distinguish an overall compatible wrist range from one supplied strap size.

AFitbit Sense 2

Size	Wrist (min) (mm)	Wrist (max) (mm)
Small	140	180
Large	180	220

Source1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Band size, printed page 63: Small band fits a wrist of 140 to 180 mm (5.5 to 7.1 in), Large band 180 to 220 mm (7.1 to 8.7 in). The Google Store page prints different ranges (130 to 180 mm and 165 to 220 mm). The manual is preferred. These are the supplied straps.

BFitbit Versa 4

Size	Wrist (min) (mm)	Wrist (max) (mm)
Small	140	180
Large	180	220

Source1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Band size table: Small 140-180 mm, Large 180-220 mm wrist circumference. The Google Store specs page prints Small 5.1-7 in and Large 6.5-8.6 in. The manual table is used.

Regulatory

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FCC ID

XRAFB5211Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026USA FCC statement: Model FB521, FCC ID XRAFB521.

XRAFB5231Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026USA FCC statement: Model FB523, FCC ID XRAFB523. IC 8542A-FB523.

SAR limb (US)iPublished limb/wrist SAR for the stated base regional model under the US regime. Other case sizes or radio versions can differ. Head or body SAR is excluded.

Not available

Not available

SAR limb (EU)iPublished limb/wrist SAR for the stated base regional model under the EU regime. Other case sizes or radio versions can differ. Head or body SAR is excluded.

Not available

Not available

Other certifications

RED (2014/53/EU), UK Radio Equipment Regulations 2017, IEC 62368-1:2014, IEC 62368-1:2020 + A11:2020, ISED Canada (IC: 8542A-FB521)1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026EU section: Fitbit LLC declares Model FB521 compliant with Directive 2014/53/EU. UK section: Radio Equipment Regulations 2017. Safety Statement lists IEC 62368-1:2014 and IEC 62368-1:2020 + A11:2020. Canada section lists IC 8542A-FB521. These are model declarations, not medical, military or diving certifications.

RED (2014/53/EU), UK Radio Equipment Regulations 2017, IEC 62368-1:20181Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Manual printed page 62 declares FB523 compliance with RED 2014/53/EU. Printed page 72 declares UK Radio Equipment Regulations 2017. Printed page 74 lists testing to IEC 62368-1:2018 safety certification. These are model declarations and safety tests, not medical, military or diving certifications.

In the box

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In the box

Fitbit Sense 2, Classic band (small & large), Charging cable1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026What's in the box: watch with small band, charging cable and an additional large band.2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026What's in the box: Fitbit Sense 2 Classic band (Small and Large), charging cable.

Fitbit Versa 4, Classic band (small & large), Charging cable2Maker product pagestore.google.com/us/product/fitbit_versa_4_specsRead 7 October 2026

Power adapter in boxiA mains/USB power adapter is supplied. A charging cable, inductive puck or charging dock alone does not count.

No1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026What's in the box lists the watch, bands and the charging cable. No power adapter. The cable plugs into a USB port or a UL-certified USB wall charger.

No2Maker product pagestore.google.com/us/product/fitbit_versa_4_specsRead 7 October 2026What's in the box lists only Fitbit Versa 4, Classic band (small & large) and Charging cable. No power adapter.

Links

Not compared

Product page

store.google.com/us/product/fitbit_sense_23Maker product pagestore.google.com/us/product/fitbit_sense_2Read 23 October 2026Google Store product page for Fitbit Sense 2 (US).

store.google.com/us/product/fitbit_versa_4_specs2Maker product pagestore.google.com/us/product/fitbit_versa_4_specsRead 7 October 2026

Spec sheet

store.google.com/us/product/fitbit_sense_2_specs2Maker product pagestore.google.com/us/product/fitbit_sense_2_specsRead 23 October 2026This page is the maker's technical specs page for Sense 2.

store.google.com/us/product/fitbit_versa_4_specs2Maker product pagestore.google.com/us/product/fitbit_versa_4_specsRead 7 October 2026Online maker specification sheet for regulatory model FB523.

Manual

storage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0d1Owner's manualstorage.googleapis.com/support-kms-prod/Cxknk8y9NHEphUUIYGTQvRVIFq1RZyQuGQ0dRead 23 October 2026Fitbit user manual, version 3.1, hosted on the Google Health Help Center user manuals page.

storage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsK1Owner's manualstorage.googleapis.com/support-kms-prod/aMr9HIIq7XWrbNCLHQyr9sA3nP2Y6JUWITsKRead 7 October 2026Versa 4 User Manual Version 2.1, linked from the Fitbit user manuals help page (support.google.com/googlehealth/answer/14253977).

EPREL registration numberiId in the EU energy label database. Each size or model of a series has its own id, so it is per variant.

Not available

Not available

Warranty

0 of 1 differ

Manufacturer warranty (source market)iThe maker's warranty period for the exact SKU or configuration and market named in the source note. It applies only to that stated market, not every regional variant. Statutory consumer rights are excluded. The base term is stored. An extension that needs registration goes in the source note.

1year8Maker product pagesupport.google.com/product-documentation/answer/14815834Read 23 October 2026Fitbit Limited Warranty: new products carry one year from purchase, two years for EEA residents who bought in the EEA. Devices bought on or after July 11, 2023 fall under the Google Hardware Warranty Center terms. Stored as the US one-year term.

1year15Maker product pagesupport.google.com/product-documentation/answer/14815834Read 7 October 2026Manufacturer contractual warranty for original new US Fitbit Versa 4 / FB523 retail units purchased before July 11, 2023: one year. Exact US Abt FB523BKBK-US also states one-year limited parts/labour warranty. The original maker contract separately gives two years for an EEA resident purchasing in the EEA, including the retained Estonian market. This scalar applies only to the stated US source-market contract, not all variants. Later purchases use the separate Google Hardware Warranty Center terms.16Retailer pageabt.com/Fitbit-Versa-4-Graphite-Aluminum-Black-Strap-Fitness-Smartwatch-24mm-FB523BKBKUS/p/182318.htmlRead 7 October 2026Exact new US FB523BKBK-US listing states one-year limited parts and labour warranty. This source-market claim is distinct from the maker two-year EEA contract and does not set the Estonian variant warranty.

Both are also in the API. Back to all smartwatches.