Smartwatches / Compare

Amazfit Balance vs Fitbit Sense 2

A

Product A: Amazfit

Balance

80 of 150 known

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B

Product B: Fitbit

Sense 2

105 of 150 known

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Every value links to where we found it.

Only differences

AAmazfit Balance

BFitbit Sense 2

General

7 of 10 differ

Series

Balance3Press releaseprnewswire.com/news-releases/zepp-health-launches-amazfit-balance-with-ai-empowered-features-for-the-ultimate-in-balanced-living-301915603.htmlRead 13 October 2026The Amazfit Balance leads Amazfit's Lifestyle Series and follows the GTR and GTS families.

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.

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

A2286, A22875Owner's manualsupport.amazfit.com/en/amazfit_balance/imgs/electronic_manual.pdfRead 13 October 2026Product manual title: A2286/A2287.

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.

GTIN / EAN

Not available

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).

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

1 September 20233Press releaseprnewswire.com/news-releases/zepp-health-launches-amazfit-balance-with-ai-empowered-features-for-the-ultimate-in-balanced-living-301915603.htmlRead 13 October 2026Release of 1 September 2023, now available via the official Amazfit website.

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.

Status

Not available

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.

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.

Amazfit Balance 29Reviewnotebookcheck.net/New-Amazfit-Balance-2-smartwatch-launches-with-longer-battery-life.1015909.0.htmlRead 23 October 2026Notebookcheck says the Amazfit Balance 2 builds on the original Amazfit Balance from 2023 and compares it with its predecessor.

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.

$229.993Press releaseprnewswire.com/news-releases/zepp-health-launches-amazfit-balance-with-ai-empowered-features-for-the-ultimate-in-balanced-living-301915603.htmlRead 13 October 2026Prices starting from $229.99 USD. US prices exclude sales tax.

$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.

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.

€249.93Press releaseprnewswire.com/news-releases/zepp-health-launches-amazfit-balance-with-ai-empowered-features-for-the-ultimate-in-balanced-living-301915603.htmlRead 13 October 2026Prices starting from 249.90 EUR, as published by Zepp Health. European prices include VAT.

€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.

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

Not available

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.

ColoursiThe maker's own colour names

Sunset Grey, Midnight2Maker product pageus.amazfit.com/products/amazfit-balanceRead 13 October 2026Color options: Sunset Grey and Midnight. The global Amazfit page also lists four Special Edition colours (Woodland, Meadow, Deep Sea Blue and Lagoon), which are not stored. Availability differs per region.

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.

Segment

Smartwatch3Press releaseprnewswire.com/news-releases/zepp-health-launches-amazfit-balance-with-ai-empowered-features-for-the-ultimate-in-balanced-living-301915603.htmlRead 13 October 2026Presented as a lifestyle smartwatch for work, leisure and workouts.

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.

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

7 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.

46mm2Maker product pageus.amazfit.com/products/amazfit-balanceRead 13 October 2026Highlights: modern thin design with 46mm (1.8in) case.

Not available

Case shape

Round7Spec databasegadgetsandwearables.com/technical-specs/amazfit-balanceRead 13 October 2026Physical size 46 x 46 mm and a 1.5 inch display. Product images show a round case.

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

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.

Mixed materials7Spec databasegadgetsandwearables.com/technical-specs/amazfit-balanceRead 13 October 2026Material: aluminum alloy middle frame and fibre-reinforced polymer bottom shell.

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.

Case material (as published)

Aluminum alloy middle frame and fibre-reinforced polymer bottom shell7Spec databasegadgetsandwearables.com/technical-specs/amazfit-balanceRead 13 October 2026Aluminum alloy middle frame + fibre-reinforced polymer bottom shell.

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.

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

Fibre-reinforced polymer bottom shell7Spec databasegadgetsandwearables.com/technical-specs/amazfit-balanceRead 13 October 2026Fibre-reinforced polymer bottom shell.

Not available

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

Height46Width46Thickness10.6mm(1.8 × 1.8 × 0.4 in)7Spec databasegadgetsandwearables.com/technical-specs/amazfit-balanceRead 13 October 2026Physical size 46 x 46 x 10.6 mm.

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.

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

35g(1.2 oz)7Spec databasegadgetsandwearables.com/technical-specs/amazfit-balanceRead 13 October 2026Weight 35 g without strap.

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

3 of 8 differ

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

5ATM1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Water-resistance Grade 5 ATM. Footnote 24 says 50 m per ISO 22810-2010.

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.

Water resistance standard

ISO 22810:20101Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Footnote 24: ISO 22810-2010.

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.

Dust and water rating

Not available

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.

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.

Min0Max45°C5Owner's manualsupport.amazfit.com/en/amazfit_balance/imgs/electronic_manual.pdfRead 13 October 2026Basic parameters: operating temperature 0 C to 45 C.

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.

Display

7 of 14 differ

Display type

OLED1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Display: Material AMOLED.

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

Display type (as published)

AMOLED1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026AMOLED.

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

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

1.5in(3.8 cm)1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Technical Specifications, Display: Size 1.5 inch.

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.

Resolution

480 × 480px1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Display: Resolution 480x480.

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

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

323ppi7Spec databasegadgetsandwearables.com/technical-specs/amazfit-balanceRead 13 October 2026480 x 480 pixels, 323 ppi.

Not available

Display area

Not available

Not available

Touchscreen

Yes6Owner's manualsupport.amazfit.com/en/amazfit_balance/files/user-manual.pdf.pdfRead 13 October 2026Swipe and tap gestures, plus the digital crown, control the watch.

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

Max refresh rateiHighest published display refresh rate in active operation.

Not available

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.

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.

Not available

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.

Minimum brightness

Not available

Not available

Always-on display

Yes6Owner's manualsupport.amazfit.com/en/amazfit_balance/files/user-manual.pdf.pdfRead 13 October 2026Always On Display setting under Settings > Display > Always On.

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).

Display cover

Other glass1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Tempered glass, which is not sapphire or Gorilla Glass, so the other glass option is used.

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

Display cover (as published)

Tempered glass with anti-glare glass bezel and anti-fingerprint coating1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Display: touchscreen of tempered glass with anti-glare glass bezel and anti-fingerprint coating.

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

Platform

10 of 15 differ

Platform

Proprietary3Press releaseprnewswire.com/news-releases/zepp-health-launches-amazfit-balance-with-ai-empowered-features-for-the-ultimate-in-balanced-living-301915603.htmlRead 13 October 2026Release: enhanced Zepp OS 3.0, Zepp Health's own watch OS.

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.

OS at launch

Zepp OS 3.03Press releaseprnewswire.com/news-releases/zepp-health-launches-amazfit-balance-with-ai-empowered-features-for-the-ultimate-in-balanced-living-301915603.htmlRead 13 October 2026Release: enhanced Zepp OS 3.0. Android Central says it ran Zepp OS 3.5 out of the box and Notebookcheck says 3.2, which are not stored.

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.

Software

Not available

Not available

Latest OS

Zepp OS 44Press releasezepp.com/press-release/zepp-health-introduces-zepp-os-4-redefining-wearable-intelligence-by-integrating-openais-gpt-4o-into-its-amazfit-smartwatchesRead 13 October 2026Release of 2 July 2024: Zepp OS 4 is available for the Amazfit Balance and Amazfit Active, the first Amazfit smartwatches to get it. The date of access dates the figure and later updates may exist.

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.

Works with

Android, iOS1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Supported Devices: Android 7.0 and above, iOS 14.0 and above.

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.

Phone requirement

Android 7.0 or iOS 14.0 or above. Needs the Zepp app.1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Supported Devices: Android 7.0 and above, iOS 14.0 and above. Application: Zepp App.5Owner's manualsupport.amazfit.com/en/amazfit_balance/imgs/electronic_manual.pdfRead 13 October 2026Device requirements: Android 7.0 or iOS 14.0 or above.

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.

App store

Yes7Spec databasegadgetsandwearables.com/technical-specs/amazfit-balanceRead 13 October 2026Zepp OS app store.8Reviewandroidcentral.com/wearables/amazfit-balance-reviewRead 13 October 2026Review: a good selection of apps. It does not have Spotify or WhatsApp.

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.

Voice assistants

Zepp Flow, Amazon Alexa1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Lifestyle Features list Zepp Flow and Amazon Alexa.4Press releasezepp.com/press-release/zepp-health-introduces-zepp-os-4-redefining-wearable-intelligence-by-integrating-openais-gpt-4o-into-its-amazfit-smartwatchesRead 13 October 2026Release: Zepp OS 4 brings Zepp Flow with GPT-4o to the Balance.8Reviewandroidcentral.com/wearables/amazfit-balance-reviewRead 13 October 2026Review: use Alexa on the watch or change the assistant to Zepp Flow.

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.

Chipset

Not available

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.

Process

Not available

Not available

CPU cores

Not available

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

CPU configuration

AAmazfit Balance

Not available

BFitbit 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.

Max CPU clock

Not available

0.192GHz=CalculatedFrom CPU configuration

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.

Not available

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.

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.

Not available

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.

Health sensors

6 of 8 differ

Heart rate sensor

BioTracker 5.0 PPG biometric optical sensor (dual-LED, 8PD)1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Sensors: BioTracker 5.0 PPG biometric sensor (8PD + 2LED). The two LEDs are stored as dual-LED.3Press releaseprnewswire.com/news-releases/zepp-health-launches-amazfit-balance-with-ai-empowered-features-for-the-ultimate-in-balanced-living-301915603.htmlRead 13 October 2026Release: upgraded dual-LED and 8PD BioTracker 5.0 PPG biometric optical 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.

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

No7Spec databasegadgetsandwearables.com/technical-specs/amazfit-balanceRead 13 October 2026ECG no.

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.

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

Yes6Owner's manualsupport.amazfit.com/en/amazfit_balance/files/user-manual.pdf.pdfRead 13 October 2026The manual explains how to wear the watch for blood oxygen measurement.7Spec databasegadgetsandwearables.com/technical-specs/amazfit-balanceRead 13 October 2026SpO2 yes, blood oxygen yes all day.

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

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

Yes1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Sensors list a temperature sensor.

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.

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

Not available

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.

Body composition sensor

Yes1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Sensors list the BIA bioelectric impedance sensor.5Owner's manualsupport.amazfit.com/en/amazfit_balance/imgs/electronic_manual.pdfRead 13 October 2026Body composition measurement with two fingers on the crown and the back button, with eight values.

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.

Skin conductance (EDA)

Not available

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).

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

Not available

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.

Motion and environment sensors

1 of 9 differ

Accelerometer

Yes1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Sensors list an acceleration sensor.

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.

Accelerometer range

Not available

Not available

Gyroscope

Yes1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Sensors list a gyroscope.

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

Barometric altimeter

Yes1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Sensors list an air pressure sensor.

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

Compass

Not available

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.

Ambient light sensor

Yes1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Sensors list an ambient light sensor.

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

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

2 of 5 differ

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

Heart rate alerts, Blood oxygen app, Heart rate variability, Sleep tracking, Stress tracking, Readiness score, Body composition3Press releaseprnewswire.com/news-releases/zepp-health-launches-amazfit-balance-with-ai-empowered-features-for-the-ultimate-in-balanced-living-301915603.htmlRead 13 October 2026Release: Readiness score each morning, and body composition measurement of body fat, skeletal muscle, muscle, water, bone mass, protein, BMI and basal metabolism.6Owner's manualsupport.amazfit.com/en/amazfit_balance/files/user-manual.pdf.pdfRead 13 October 2026Readiness score, body composition, heart rate alerts and sleep. Also stress and HRV in the Readiness explanation.7Spec databasegadgetsandwearables.com/technical-specs/amazfit-balanceRead 13 October 2026Sleep yes, HRV yes, stress yes, blood oxygen yes, heart rate alerts for arrhythmia and atrial fibrillation, body composition yes (BIA).

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.

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, Training load, Recovery advice, Pool swim, Open water swim, Route navigation, Trackback6Owner's manualsupport.amazfit.com/en/amazfit_balance/files/user-manual.pdf.pdfRead 13 October 2026Over 150 workout modes with automatic workout identification, VO2 Max, training load and total recovery time, pool and open water swimming, track navigation with route import, and return to start with Backtrack.

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.

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

1 of 6 differ

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

No7Spec databasegadgetsandwearables.com/technical-specs/amazfit-balanceRead 13 October 2026Fall detection no.

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.

Car crash detection

Not available

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.

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.

No7Spec databasegadgetsandwearables.com/technical-specs/amazfit-balanceRead 13 October 2026Emergency SOS no.

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.

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.

No7Spec databasegadgetsandwearables.com/technical-specs/amazfit-balanceRead 13 October 2026LED flashlight no.

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.

Positioning

3 of 3 differ

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

Not available

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.

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

Yes1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Positioning: dual-band positioning with 6 satellite positioning systems. The systems are not named, so no positioning list is stored.

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.

Not available

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

Connectivity

5 of 15 differ

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

Yes1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Connection: Bluetooth 5.0.

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

Bluetooth version

5.05Owner's manualsupport.amazfit.com/en/amazfit_balance/imgs/electronic_manual.pdfRead 13 October 2026Basic parameters: Bluetooth version V5.0.

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.

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

Yes1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Connection: WLAN 2.4GHz.

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.

Wi-Fi standard

Wi-Fi 45Owner's manualsupport.amazfit.com/en/amazfit_balance/imgs/electronic_manual.pdfRead 13 October 2026Basic parameters: Wi-Fi 2.4 GHz 802.11 b/g/n, so Wi-Fi 4 on one band.

Not available

Wi-Fi bands

2.4 GHz5Owner's manualsupport.amazfit.com/en/amazfit_balance/imgs/electronic_manual.pdfRead 13 October 2026Wi-Fi frequency 2402-2480 MHz, 2.4 GHz only.

Not available

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

No7Spec databasegadgetsandwearables.com/technical-specs/amazfit-balanceRead 13 October 2026Cellular no.

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

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.

Yes7Spec databasegadgetsandwearables.com/technical-specs/amazfit-balanceRead 13 October 2026NFC / connected pay yes (Zepp Pay, region-dependent).

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

Contactless payments

Yes3Press releaseprnewswire.com/news-releases/zepp-health-launches-amazfit-balance-with-ai-empowered-features-for-the-ultimate-in-balanced-living-301915603.htmlRead 13 October 2026Release: Zepp Pay contactless payment.7Spec databasegadgetsandwearables.com/technical-specs/amazfit-balanceRead 13 October 2026NFC / connected pay yes (Zepp Pay, region-dependent).

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.

Payment services

Zepp Pay3Press releaseprnewswire.com/news-releases/zepp-health-launches-amazfit-balance-with-ai-empowered-features-for-the-ultimate-in-balanced-living-301915603.htmlRead 13 October 2026Release: Zepp Pay contactless payment, with Mastercard issuing banks and Curve.

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.

Ultra-wideband

No7Spec databasegadgetsandwearables.com/technical-specs/amazfit-balanceRead 13 October 2026UWB no.

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.

Satellite

Not available

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.

ANT+

Not available

Not available

Audio

1 of 4 differ

Speaker

Yes1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Other: Microphone and Speaker are listed as supported.8Reviewandroidcentral.com/wearables/amazfit-balance-reviewRead 13 October 2026Review: microphone and speaker onboard.

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.

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 only6Owner's manualsupport.amazfit.com/en/amazfit_balance/files/user-manual.pdf.pdfRead 13 October 2026Bluetooth calling: pair the watch with the phone and make calls through the Phone app on the watch.

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.

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

Yes1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Lifestyle Features: Music Storage up to 2.2GB.7Spec databasegadgetsandwearables.com/technical-specs/amazfit-balanceRead 13 October 2026On-board music storage yes.8Reviewandroidcentral.com/wearables/amazfit-balance-reviewRead 13 October 2026Review: local storage and Bluetooth let you store music on the watch and stream it to earbuds.

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

Controls

3 of 5 differ

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

15Owner's manualsupport.amazfit.com/en/amazfit_balance/imgs/electronic_manual.pdfRead 13 October 2026Upper button doubles as the rotating crown. One lower button is counted.

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

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

Lower button5Owner's manualsupport.amazfit.com/en/amazfit_balance/imgs/electronic_manual.pdfRead 13 October 2026About the watch: upper button that rotates, and a lower button that starts an app.

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.

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

Rotating5Owner's manualsupport.amazfit.com/en/amazfit_balance/imgs/electronic_manual.pdfRead 13 October 2026Upper button: rotate to switch pages. User manual calls it the digital crown.

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

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

None5Owner's manualsupport.amazfit.com/en/amazfit_balance/imgs/electronic_manual.pdfRead 13 October 2026About the watch lists the upper button, lower button, charging contacts, heart rate sensor and biosensors. It lists no rotating bezel.

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

Gestures

Not available

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.

Battery and charging

8 of 13 differ

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

475mAh1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026475 mAh (rated value).

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.

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.

AAmazfit Balance

Mode	With solar	Hours (h)
Smartwatch	No	336
Heavy use	No	168
Always-on	No	120
Low power	No	600
Time only	No	1,200
GPS, dual-band	No	26
GPS, power saving	No	52

Source1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Typical use up to 14 days, heavy use up to 7 days, AOD mode up to 5 days, Battery Saver up to 25 days and Clock Mode up to 50 days. Accuracy GPS up to 26 hours and Power Saving GPS up to 52 hours. Automatic GPS is listed at 47 hours with a footnote of about 44 hours, so it is left out. Days are converted to hours exactly. Accuracy GPS is stored as the dual-frequency mode and Power Saving GPS as the GPS power saving mode, after the maker preset name. A second copy of the table on the same page lists Battery Saver as 14 days. The highlights, the first table and the US, German and India pages all say 25 days, so 25 is stored.2Maker product pageus.amazfit.com/products/amazfit-balanceRead 13 October 2026Highlights: 14 days typical usage, 5 days AOD mode and 25 days Battery Saver Mode. The FAQ also says battery saver mode extends it to 25 days.

BFitbit 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.

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.

336h=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.

120h=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.

Not available

5h=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 pins1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Battery: Magnetic charging.

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.

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

The manual lists an input of DC 5 V 800 mA max and says to use a power adapter of 1 A or above. The watch sits in the supplied charging base with metal contacts. The adapter is not in the box.5Owner's manualsupport.amazfit.com/en/amazfit_balance/imgs/electronic_manual.pdfRead 13 October 2026Charging: use the charging base that comes with the watch. Use a 1 A or above power adapter. Input DC 5 V 800 mA max.

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.

Not available

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.

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

Not available

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 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.

120min1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Theoretical charging duration approx. 2 hours. Nominal claim.

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.

Measured

3 of 4 differ

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.

Not available

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.

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

AAmazfit Balance

Not available

BFitbit 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.

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.

Not available

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.

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.

22mm1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Strap: Width 22mm.

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.

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

Not available

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.

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

22 mm nylon or liquid silicone strap1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Strap: nylon and liquid silicone, width 22mm, with hook-and-loop (nylon) or pin buckle (silicone).

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.

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

Not available

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.

Strap

Not available

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

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

AAmazfit Balance

Size	Wrist (min) (mm)	Wrist (max) (mm)
Silicone strap	140	215
Nylon strap	140	210

Source1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Strap wrist dimensions: 140 to 215 mm for the liquid silicone strap and 140 to 210 mm for the nylon strap.

BFitbit 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.

Regulatory

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FCC ID

Not available

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

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

Not available

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.

In the box

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In the box

Smartwatch with band × 1, Charging base × 1, Instruction Manual × 11Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Packing List: smartwatch with standard strap, magnetic charging cable and instruction manual. The manual lists a charging base.5Owner's manualsupport.amazfit.com/en/amazfit_balance/imgs/electronic_manual.pdfRead 13 October 2026Package contents: smartwatch with the band, charging base and instruction manual.

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.

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

No5Owner's manualsupport.amazfit.com/en/amazfit_balance/imgs/electronic_manual.pdfRead 13 October 2026Package contents list no power adapter.

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.

Links

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Product page

www.amazfit.com/products/amazfit-balance1Maker product pageamazfit.com/products/amazfit-balanceRead 13 October 2026Amazfit global store page for the Amazfit Balance, with the full Technical Specifications table.

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).

Spec sheet

Not available

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.

Manual

support.amazfit.com/en/amazfit_balance/files/user-manual.pdf.pdf6Owner's manualsupport.amazfit.com/en/amazfit_balance/files/user-manual.pdf.pdfRead 13 October 2026Amazfit Balance user manual, 59 pages.

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.

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

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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.

Not available

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.

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