Smartwatches / Compare

Garmin Forerunner 255 vs Suunto Run 2

A

Product A: Garmin

Forerunner 255

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B

Product B: Suunto

Run 2

80 of 150 known

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Every value links to where we found it.

Only differences

AGarmin Forerunner 255

BSuunto Run 2

General

7 of 10 differ

Series

Forerunner1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Product page title is Forerunner 255, running smartwatch, 46 mm.

Run1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Maker names the Suunto Run line. The page is Suunto Run 2.

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

010-02641-011Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026US page for the 46 mm watch without music lists part number 010-02641-01 (Tidal Blue, $349.99). The Music toggle on the same page links the music watch to 010-02641-20, so music watches are other models. 255S is the 41 mm size, SKU 010-02641-02.

SS051723000, SS051724000, SS051725000, SS051639000, SS051640000, SS051641000, OW2612Maker product pageus.suunto.com/products/suunto-run-2-all-black.jsRead 14 October 2026Suunto US store product data lists SS051639000 (All Black, 64 GB), SS051640000 (Feather Gold, 64 GB), SS051641000 (Aloe Green, 64 GB), SS051723000 (All Black, 4 GB), SS051724000 (Feather Gold, 4 GB) and SS051725000 (Aloe Green, 4 GB). OW261 is the hardware type in the safety guide.4Maker spec sheet (PDF)ns.suunto.com/Manuals/Suunto_Run_2/Safty_and_Regulatory/Run%202%20Safty_and_Regulatory.pdfRead 14 October 2026English section, printed pages 4 to 8: radio equipment type and model no. OW261. The online guide and the PDF guide print OW234 in their CE section, which looks copied from the original Suunto Run, so OW261 from the Run 2 safety guide is used.

GTIN / EAN

Not available

6417084219831, 6417084219848, 6417084219855, 6417084218834, 6417084218841, 641708421885811Retailer pagewatchnation.com/products/suunto-run-2-46-5mm-4gb-amoled-digital-all-black-silicone-smart-fitness-watch-ss051723000Read 14 October 2026Watchnation product page for SS051723000 (All Black, 4 GB) lists GTIN 6417084219831. The EAN-13 check digit is valid. Maker pages do not publish GTINs.12Retailer pagewatchnation.com/products/suunto-run-2-46-5mm-4gb-amoled-digital-feather-gold-silicone-smart-fitness-watch-ss051724000Read 14 October 2026Watchnation product page for SS051724000 (Feather Gold, 4 GB) lists GTIN 6417084219848. The EAN-13 check digit is valid. Maker pages do not publish GTINs.13Retailer pagewatchnation.com/products/suunto-run-2-46-5mm-4gb-amoled-digital-aloe-green-silicone-smart-fitness-watch-ss051725000Read 14 October 2026Watchnation product page for SS051725000 (Aloe Green, 4 GB) lists GTIN 6417084219855. The EAN-13 check digit is valid. Maker pages do not publish GTINs.14Retailer pagewatchnation.com/products/suunto-run-2-46-5mm-64gb-amoled-digital-all-black-silicone-smart-fitness-watch-ss051639000Read 14 October 2026Watchnation product page for SS051639000 (All Black, 64 GB) lists GTIN 6417084218834. The EAN-13 check digit is valid. Maker pages do not publish GTINs.15Retailer pagewatchnation.com/products/suunto-run-2-46-5mm-64gb-amoled-digital-feather-gold-silicone-smart-fitness-watch-ss051640000Read 14 October 2026Watchnation product page for SS051640000 (Feather Gold, 64 GB) lists GTIN 6417084218841. The EAN-13 check digit is valid. Maker pages do not publish GTINs.16Retailer pagewatchnation.com/products/suunto-run-2-46-5mm-64gb-amoled-digital-aloe-green-silicone-smart-fitness-watch-ss051641000Read 14 October 2026Watchnation product page for SS051641000 (Aloe Green, 64 GB) lists GTIN 6417084218858. The EAN-13 check digit is valid. Maker pages do not publish GTINs.

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

1 June 20223Press releasegarmin.com/en-US/newsroom/press-release/sports-fitness/garmin-celebrates-global-running-day-with-the-introduction-of-the-forerunner-255-seriesRead 11 October 2026Garmin release dated June 1, 2022.

8 September 20265Reviewtomsguide.com/wellness/smartwatches/i-tested-the-suunto-run-2-for-two-weeks-and-its-an-accurate-and-attractive-sports-watch-with-mapsRead 14 October 2026Tom's Guide: the Suunto Run 2 launched on 8 September 2026.6Press articleactive.com/running/articles/suunto-run-2-launchRead 14 October 2026Launch report: pre-orders open September 8, 2026 at $349 for 4 GB and $399 for 64 GB.

Status

Not available

Available2Maker product pageus.suunto.com/products/suunto-run-2-all-black.jsRead 14 October 2026All six variants show as available on the US store. The products were published on 2026-09-08.

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.

Garmin Forerunner 2658Reviewdcrainmaker.com/2023/03/garmin-forerunner-review-amoled.htmlRead 11 October 2026Review: the Forerunner 265 series at first glance seems like an AMOLED version of the Forerunner 255, with several hardware differences. It follows the 255 in the Forerunner line.10Maker product pagegarmin.com/nl-NL/blogRead 23 October 2026Garmin's Dutch blog says the Forerunner 265 is the successor of the Forerunner 255.

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.

$349.993Press releasegarmin.com/en-US/newsroom/press-release/sports-fitness/garmin-celebrates-global-running-day-with-the-introduction-of-the-forerunner-255-seriesRead 11 October 2026Suggested retail price $349.99 for Forerunner 255 and 255S. Music models are $399.99.

$3492Maker product pageus.suunto.com/products/suunto-run-2-all-black.jsRead 14 October 2026US store list price 349.00 USD for the 4 GB editions and 399.00 USD for the 64 GB editions. US sales tax is not included. The base value is the 4 GB edition.5Reviewtomsguide.com/wellness/smartwatches/i-tested-the-suunto-run-2-for-two-weeks-and-its-an-accurate-and-attractive-sports-watch-with-mapsRead 14 October 2026Launch prices $349 (4 GB) and $399 (64 GB), as on the Suunto US store.

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.

€349.994Press articlenextpit.de/news/garmin-forerunner-255-und-955-vorgestellt-touchscreen-mehr-akkuRead 11 October 2026nextpit.de, 1 June 2022: the Forerunner 255 costs 349,99 EUR in every size, the Music edition 50 EUR more. German price incl. VAT.

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, DE3Press releasegarmin.com/en-US/newsroom/press-release/sports-fitness/garmin-celebrates-global-running-day-with-the-introduction-of-the-forerunner-255-seriesRead 11 October 2026US release with US dollar suggested retail prices.4Press articlenextpit.de/news/garmin-forerunner-255-und-955-vorgestellt-touchscreen-mehr-akkuRead 11 October 2026German launch pricing in euros. Documented subset together with the US release.

US2Maker product pageus.suunto.com/products/suunto-run-2-all-black.jsRead 14 October 2026US store. Regional stores show other currencies.

ColoursiThe maker's own colour names

Tidal Blue1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026US store lists Tidal Blue for this model. Other regional colours exist but are not listed on this page.3Press releasegarmin.com/en-US/newsroom/press-release/sports-fitness/garmin-celebrates-global-running-day-with-the-introduction-of-the-forerunner-255-seriesRead 11 October 2026Release names tidal blue as a new colour.

All Black, Feather Gold, Aloe Green1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Three colours: All Black, Feather Gold and Aloe Green. Each comes in a 4 GB and a 64 GB edition.

Segment

Sport1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Garmin presents it as a running smartwatch.

Sport1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Suunto calls it a lightweight running watch for marathon training and road running.

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

5 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.

46mm1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026

46.5mm1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Suunto publishes no marketed case size. 46.5 mm is the stated width and height. The Watch diameter label and the product images show a round case.

Case shape

Round1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Specs describe the display as a diameter and the pictured case is round.

Round1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026The size is labelled Watch diameter and the maker images show a round case.

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.

Fibre-reinforced polymer6Reviewandroidcentral.com/wearables/garmin-forerunner-255-reviewRead 11 October 2026Review spec box: materials fiber-reinforced polymer. The maker lists only the bezel as fiber-reinforced polymer and no other case material.7Spec databasegadgetsandwearables.com/technical-specs/garmin-forerunner-255Read 11 October 2026Spec table: fiber-reinforced polymer bezel and case, silicone strap.

Fibre-reinforced polymer1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Specification data: case material glass fibre reinforced polyamide, bezel material stainless steel, lens Gorilla glass, strap silicone. The housing is not classed as stainless steel.

Case material (as published)

Fiber-reinforced polymer6Reviewandroidcentral.com/wearables/garmin-forerunner-255-reviewRead 11 October 2026Review spec box wording.7Spec databasegadgetsandwearables.com/technical-specs/garmin-forerunner-255Read 11 October 2026Spec table wording.

Glass fibre reinforced polyamide case with stainless steel bezel1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026

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

Not available

Not available

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

Height45.6Width45.6Thickness12.9mm(1.8 × 1.8 × 0.5 in)1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Specs: Physical size 45.6 x 45.6 x 12.9 mm. Not stated whether the heart rate sensor bump is included.

Height46.5Width46.5Thickness11.66mm(1.8 × 1.8 × 0.5 in)1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Measurement data: width 46.5, height 46.5 and depth 11.66 mm. The What's New table on the same page rounds this to 46 x 46 x 11.7 mm. The exact values are stored. Sensor protrusion exclusions are not stated.

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

Not available

35g(1.2 oz)1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Page text: 35 g watch body.

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

53g(1.9 oz)1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Page text: with the official Suunto silicone strap the total weight is 53 g. Reviews give about 53 to 54 g.

Durability

2 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 pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Specs: Water rating 5 ATM.

5ATM1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Specifications > General: water resistance 50 m.4Maker spec sheet (PDF)ns.suunto.com/Manuals/Suunto_Run_2/Safty_and_Regulatory/Run%202%20Safty_and_Regulatory.pdfRead 14 October 2026Operating conditions: water resistance 50 m / 164 ft / 5 bar.

Water resistance standard

Not available

Not available

Dust and water rating

Not available

IPX84Maker spec sheet (PDF)ns.suunto.com/Manuals/Suunto_Run_2/Safty_and_Regulatory/Run%202%20Safty_and_Regulatory.pdfRead 14 October 2026Operating conditions: IP-class IPX8.

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-20Max60°C2Owner's manualwww8.garmin.com/manuals/webhelp/GUID-676967A0-1B23-4384-9BC9-76F3D643F1C8/EN-US/Forerunner_255_OM_EN-US.pdfRead 11 October 2026Specifications page 101: operating temperature -20 to 60 C. Charging range 0 to 45 C is excluded.

Min-20Max55°C1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Specifications > Physical specifications: operating temperature -20 to +55 C. Storage uses the same range. The recommended charging range is separate.4Maker spec sheet (PDF)ns.suunto.com/Manuals/Suunto_Run_2/Safty_and_Regulatory/Run%202%20Safty_and_Regulatory.pdfRead 14 October 2026The English temperature bullets are blank in the PDF text. The BG, CS and DA sections give operating and storage temperature -20 to +55 C, which matches the product page.

Display

8 of 14 differ

Display type

MIP1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Specs: Display type sunlight-visible, transflective memory-in-pixel (MIP).

OLED1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026

Display type (as published)

Sunlight-visible, transflective memory-in-pixel (MIP)1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026

LTPS AMOLED1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Page: LTPS AMOLED panel type. No LTPO or variable refresh rate is claimed.

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

1.3in(3.3 cm)1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Specs: 1.3 inch (33 mm) diameter.

1.32in(3.4 cm)1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Specifications > General: display size 1.32 inch.

Resolution

260 × 260px1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Specs: 260 x 260 pixels.

466 × 466px1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026

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

No2Owner's manualwww8.garmin.com/manuals/webhelp/GUID-676967A0-1B23-4384-9BC9-76F3D643F1C8/EN-US/Forerunner_255_OM_EN-US.pdfRead 11 October 2026The manual describes control only with the LIGHT, UP, DOWN, BACK and START/STOP buttons and never mentions touch input.

Yes1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026The product page and the guide describe a touch screen.

Max refresh rateiHighest published display refresh rate in active operation.

Not available

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.

Not available

2,000nits1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Maker claim of a 2,000 nit display. Window size, ambient light and duration are not stated, so it is a claim and not a measurement.

Minimum brightness

Not available

Not available

Always-on display

Not available

Yes3Owner's manualns.suunto.com/Manuals/Suunto_Run_2/Userguides/Suunto_Run_2_UserGuide_EN.PDFRead 14 October 2026Display settings: Always-on display can be toggled on or off. It reduces battery life by about 30%.

Display cover

Gorilla Glass1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026

Gorilla Glass1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026

Display cover (as published)

Corning Gorilla Glass 31Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Specs: Lens material Corning Gorilla Glass 3. Bezel material is fiber-reinforced polymer. Case material is not listed, so case_material is not stored.

Gorilla Glass1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Page: Gorilla Glass lens.

Platform

1 of 15 differ

Platform

Proprietary1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Garmin watch software with downloadable Connect IQ watch faces, data fields and apps.

Proprietary8Spec databasegadgetsandwearables.com/technical-specs/suunto-run-2Read 14 October 2026Operating system: Proprietary.

OS at launch

Not available

Not available

Software

Not available

Not available

Latest OS

Not available

Not available

Works with

iOS, Android1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026

iOS, Android3Owner's manualns.suunto.com/Manuals/Suunto_Run_2/Userguides/Suunto_Run_2_UserGuide_EN.PDFRead 14 October 2026The guide shows the Suunto app for Android and for iOS.

Phone requirement

Not available

Not available

App store

Yes1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Specs list Connect IQ downloadable watch faces, data fields and apps and an on-device Connect IQ store.

Not available

Voice assistants

Not available

Not available

Chipset

Not available

Not available

Process

Not available

Not available

CPU cores

Not available

Not available

CPU configuration

Not available

Not available

Max CPU clock

Not available

Not available

GPU

Not available

Not available

Low-power coprocessor

Not available

Not available

Memory

1 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

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.

4GB1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Specs: Memory/History 4 GB. The manual lists up to 4 GB of music storage for Music models only.2Owner's manualwww8.garmin.com/manuals/webhelp/GUID-676967A0-1B23-4384-9BC9-76F3D643F1C8/EN-US/Forerunner_255_OM_EN-US.pdfRead 11 October 2026Music storage up to 4 GB applies to Music models.

4, 64GB1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Specifications: offline map storage size 4GB (Standard, maps and music) or 64GB (Premium, maps and music). The 64 GB edition costs $50 more.

Health sensors

3 of 8 differ

Heart rate sensor

Garmin Elevate wrist heart rate monitor1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026

12-channel optical wrist heart rate sensor1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026A 12-channel sensor behind 2.5D curved glass. 24/7 heart rate tracking is claimed.

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/garmin-forerunner-255Read 11 October 2026Spec table: electrical heart rate No, ECG No. The Garmin product page lists no ECG sensor or app.

Not available

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

Yes1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Specs: Pulse Ox blood oxygen, spot-check and optional all-day acclimation and in sleep. Not available in all countries.

Yes3Owner's manualns.suunto.com/Manuals/Suunto_Run_2/Userguides/Suunto_Run_2_UserGuide_EN.PDFRead 14 October 2026Blood oxygen widget measures on demand and during sleep. It is not a medical device.

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

No2Owner's manualwww8.garmin.com/manuals/webhelp/GUID-676967A0-1B23-4384-9BC9-76F3D643F1C8/EN-US/Forerunner_255_OM_EN-US.pdfRead 11 October 2026The manual describes an internal temperature sensor whose reading is affected by body temperature and offers an external tempe sensor for ambient temperature. No skin temperature function is described.7Spec databasegadgetsandwearables.com/technical-specs/garmin-forerunner-255Read 11 October 2026Spec table: skin temperature No. The Garmin page lists only a thermometer.

Not available

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

Not available

Not available

Body composition sensor

Not available

Not available

Skin conductance (EDA)

Not available

Not available

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

Not available

Not available

Motion and environment sensors

1 of 9 differ

Accelerometer

Yes1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026

Yes3Owner's manualns.suunto.com/Manuals/Suunto_Run_2/Userguides/Suunto_Run_2_UserGuide_EN.PDFRead 14 October 2026Sleep tracking uses accelerometer data.

Accelerometer range

Not available

Not available

Gyroscope

Yes1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026

Yes3Owner's manualns.suunto.com/Manuals/Suunto_Run_2/Userguides/Suunto_Run_2_UserGuide_EN.PDFRead 14 October 2026Compass: Suunto Run 2 has a gyro-assisted compass. Gadgets & Wearables lists no gyroscope, but the maker text is followed.

Barometric altimeter

Yes1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026

Yes3Owner's manualns.suunto.com/Manuals/Suunto_Run_2/Userguides/Suunto_Run_2_UserGuide_EN.PDFRead 14 October 2026Alti & Baro: constant absolute air pressure measurement with the built-in pressure sensor.

Compass

Yes1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026

Yes3Owner's manualns.suunto.com/Manuals/Suunto_Run_2/Userguides/Suunto_Run_2_UserGuide_EN.PDFRead 14 October 2026Compass widget: a tilt-compensated gyro-assisted compass.

Ambient light sensor

No7Spec databasegadgetsandwearables.com/technical-specs/garmin-forerunner-255Read 11 October 2026Spec table: ambient light sensor No. The Garmin sensor list has none.

Yes8Spec databasegadgetsandwearables.com/technical-specs/suunto-run-2Read 14 October 2026Ambient light sensor: Yes. The maker lists automatic backlight brightness.

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

3 of 5 differ

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, Blood oxygen app, Heart rate variability, Sleep tracking, Sleep stages, Stress tracking, Cycle tracking1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Specs list heart rate every second, high and low abnormal heart rate alerts, Pulse Ox, HRV status, advanced sleep, all-day stress and women's health in Garmin Connect. Sleep stages are in the manual.2Owner's manualwww8.garmin.com/manuals/webhelp/GUID-676967A0-1B23-4384-9BC9-76F3D643F1C8/EN-US/Forerunner_255_OM_EN-US.pdfRead 11 October 2026Sleep statistics include total hours of sleep, sleep stages and sleep score (page 42 area).

Continuous heart rate, Heart rate alerts, Heart rate variability, Sleep tracking, Blood oxygen app1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 202624/7 heart rate tracking is claimed on the product page. The guide describes a high heart rate alert, HRV tracking during sleep, sleep tracking and a blood oxygen widget. Sleep tracking is based on movement only, so sleep stages are not stored. These are recreational features and not medical functions.3Owner's manualns.suunto.com/Manuals/Suunto_Run_2/Userguides/Suunto_Run_2_UserGuide_EN.PDFRead 14 October 2026Heart rate widget: high heart rate alert. Sleep: optional HRV and blood oxygen tracking during sleep. Sleep is movement-based.

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.

VO2 max, Training load, Recovery advice, Running dynamics, Running power, Pool swim, Open water swim, Strength rep counting, Interval workouts, Route navigation, Trackback1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Specs list VO2 Max (run), training load, recovery time, running dynamics, running power, pool and open-water swim metrics, automatic rep counting, interval training, course guidance and TracBack. Running dynamics need a pod or HRM-Pro. No golf course or ClimbPro entry.2Owner's manualwww8.garmin.com/manuals/webhelp/GUID-676967A0-1B23-4384-9BC9-76F3D643F1C8/EN-US/Forerunner_255_OM_EN-US.pdfRead 11 October 2026Page 62: running power can be measured with a compatible running dynamics accessory or the watch sensors. Page 63: Running Dynamics Pod records running dynamics.

VO2 max, Training load, Recovery advice, Pool swim, Open water swim, Route navigation3Owner's manualns.suunto.com/Manuals/Suunto_Run_2/Userguides/Suunto_Run_2_UserGuide_EN.PDFRead 14 October 2026Progress widget: training load, VO2max fitness level estimate and fitness age. Recovery widget: a recovery percentage with rest advice. Swimming: pool and open-water modes. Routes: route navigation from the Suunto app. Find back is direct guidance to the start, not a retraced track, so trackback is not stored. No turn-by-turn directions are described. Power zones need a power source, so running power is not stored.

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.

Heart rate strap, Power meter, Speed and cadence, Foot pod, Smart trainer1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Specs list heart rate from external HRM, power meter compatible, speed and cadence sensor support, foot pod capable and smart trainer control.

Heart rate strap, Foot pod1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Specifications list Bluetooth heart rate belts and Suunto Foot POD support. The guide's pairing list names heart rate and foot sensors only.3Owner's manualns.suunto.com/Manuals/Suunto_Run_2/Userguides/Suunto_Run_2_UserGuide_EN.PDFRead 14 October 2026Pair devices: heart rate sensors and foot pods.

Safety

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

No1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Specs list only incident detection during select activities, which is limited to certain outdoor activities. Not counted as general fall detection.2Owner's manualwww8.garmin.com/manuals/webhelp/GUID-676967A0-1B23-4384-9BC9-76F3D643F1C8/EN-US/Forerunner_255_OM_EN-US.pdfRead 11 October 2026Page 83: incident detection is a supplemental feature available only for certain outdoor activities.

Not available

Car crash detection

Not available

Not available

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.

Yes1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Specs list Assistance. The manual says it sends a message with name, LiveTrack link and GPS location to emergency contacts through a paired phone with data. It does not call emergency services.2Owner's manualwww8.garmin.com/manuals/webhelp/GUID-676967A0-1B23-4384-9BC9-76F3D643F1C8/EN-US/Forerunner_255_OM_EN-US.pdfRead 11 October 2026Safety and Tracking, page 84: Assistance sends a message with name, LiveTrack link and GPS location to emergency contacts. Paired phone with data plan required.

Not available

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.

Yes1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Specs list live event sharing (Android only). The manual lists LiveTrack.2Owner's manualwww8.garmin.com/manuals/webhelp/GUID-676967A0-1B23-4384-9BC9-76F3D643F1C8/EN-US/Forerunner_255_OM_EN-US.pdfRead 11 October 2026Safety and Tracking: LiveTrack lets friends and family follow activities in real time.

Not available

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

No2Owner's manualwww8.garmin.com/manuals/webhelp/GUID-676967A0-1B23-4384-9BC9-76F3D643F1C8/EN-US/Forerunner_255_OM_EN-US.pdfRead 11 October 2026Controls menu: Flashlight turns on the screen to use the watch as a flashlight. A lit display is not a dedicated LED.7Spec databasegadgetsandwearables.com/technical-specs/garmin-forerunner-255Read 11 October 2026Spec table: LED flashlight No, matching the manual.

No3Owner's manualns.suunto.com/Manuals/Suunto_Run_2/Userguides/Suunto_Run_2_UserGuide_EN.PDFRead 14 October 2026The Flashlight app lights the display (white, flicker or red). It is not a dedicated hardware LED.

Positioning

2 of 3 differ

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

GPS, GLONASS, Galileo, QZSS, BeiDou1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Specs list GPS, GLONASS, Galileo, QZSS and BeiDou. Multi-band GPS is listed. Signal bands are not named.

GPS, GLONASS, Galileo, BeiDou, QZSS, L1 + L5 GNSS1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Specifications list GPS, GLONASS, Galileo, QZSS and BeiDou. The page says dual-band L1 + L5 positioning across all five systems.

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

Yes1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Specs list Multi-band GPS. Battery table calls it All-Systems GNSS plus Multi-Band.

Yes1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Specifications: GNSS frequency support Dual band (L1+L5).

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

No1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026No map entry in the specs. Only breadcrumb trail, courses and TracBack are listed, which are not offline maps.

Yes1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Offline maps on watch with free worldwide maps and no subscription.

Connectivity

7 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 pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026

Yes4Maker spec sheet (PDF)ns.suunto.com/Manuals/Suunto_Run_2/Safty_and_Regulatory/Run%202%20Safty_and_Regulatory.pdfRead 14 October 2026Radio list: Bluetooth LE at 2400-2483.5 MHz. No Bluetooth version is published.

Bluetooth version

Not available

Not available

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

No2Owner's manualwww8.garmin.com/manuals/webhelp/GUID-676967A0-1B23-4384-9BC9-76F3D643F1C8/EN-US/Forerunner_255_OM_EN-US.pdfRead 11 October 2026Status icons: Wi-Fi technology status for Forerunner music watches only. The spec table lists no Wi-Fi for this model.

Yes4Maker spec sheet (PDF)ns.suunto.com/Manuals/Suunto_Run_2/Safty_and_Regulatory/Run%202%20Safty_and_Regulatory.pdfRead 14 October 2026Radio list: 2.4G Wi-Fi and 5G Wi-Fi.

Wi-Fi standard

Not available

Wi-Fi 64Maker spec sheet (PDF)ns.suunto.com/Manuals/Suunto_Run_2/Safty_and_Regulatory/Run%202%20Safty_and_Regulatory.pdfRead 14 October 2026Radio list names 802.11b/g/n/ax for the 2.4 GHz and 5 GHz Wi-Fi. 802.11ax maps to Wi-Fi 6.

Wi-Fi bands

Not available

2.4 GHz, 5 GHz4Maker spec sheet (PDF)ns.suunto.com/Manuals/Suunto_Run_2/Safty_and_Regulatory/Run%202%20Safty_and_Regulatory.pdfRead 14 October 2026Radio list: 2400-2483.5 MHz, 5150-5250 MHz and 5725-5850 MHz.

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

No1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Specs list Connectivity as Bluetooth and ANT+ only. No Wi-Fi and no cellular.

No4Maker spec sheet (PDF)ns.suunto.com/Manuals/Suunto_Run_2/Safty_and_Regulatory/Run%202%20Safty_and_Regulatory.pdfRead 14 October 2026The complete radio list has no cellular radio.

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.

Yes1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Garmin Pay contactless payments are listed. NFC itself is not named in the specs.

No4Maker spec sheet (PDF)ns.suunto.com/Manuals/Suunto_Run_2/Safty_and_Regulatory/Run%202%20Safty_and_Regulatory.pdfRead 14 October 2026The complete radio list has Bluetooth LE, 2.4 GHz Wi-Fi, 5 GHz Wi-Fi and a GNSS receiver only, with no 13.56 MHz NFC radio. Reviews also say there are no NFC payments.

Contactless payments

Yes1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Garmin Pay is listed.

No5Reviewtomsguide.com/wellness/smartwatches/i-tested-the-suunto-run-2-for-two-weeks-and-its-an-accurate-and-attractive-sports-watch-with-mapsRead 14 October 2026There are no NFC payments on the watch.

Payment services

Garmin Pay1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026

Not available

Ultra-wideband

No7Spec databasegadgetsandwearables.com/technical-specs/garmin-forerunner-255Read 11 October 2026Spec table: UWB No. Garmin lists Bluetooth and ANT+ only.

No4Maker spec sheet (PDF)ns.suunto.com/Manuals/Suunto_Run_2/Safty_and_Regulatory/Run%202%20Safty_and_Regulatory.pdfRead 14 October 2026The complete radio list has no ultra-wideband radio. Gadgets & Wearables also lists no UWB.

Satellite

Not available

Not available

ANT+

Yes1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026

Not available

Audio

1 of 4 differ

Speaker

No7Spec databasegadgetsandwearables.com/technical-specs/garmin-forerunner-255Read 11 October 2026Spec table: speakers No. Garmin lists no voice calls, speaker or music playback for this non-music model.

No8Spec databasegadgetsandwearables.com/technical-specs/suunto-run-2Read 14 October 2026Speakers: No. The watch plays tones and alarms through a beeper. This is a single secondary source.

Microphones

07Spec databasegadgetsandwearables.com/technical-specs/garmin-forerunner-255Read 11 October 2026Spec table: microphone No. Garmin lists no voice calls or microphone for this model.

08Spec databasegadgetsandwearables.com/technical-specs/suunto-run-2Read 14 October 2026Microphone: No. The maker describes no voice or calling features. This is a single secondary source.

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

None1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Specs list text response and reject phone call with text only. No voice call, speaker or microphone entry and no cellular. No voice calls on the watch.

None3Owner's manualns.suunto.com/Manuals/Suunto_Run_2/Userguides/Suunto_Run_2_UserGuide_EN.PDFRead 14 October 2026Notifications show incoming calls and texts from the paired phone. No calling features are described.5Reviewtomsguide.com/wellness/smartwatches/i-tested-the-suunto-run-2-for-two-weeks-and-its-an-accurate-and-attractive-sports-watch-with-mapsRead 14 October 2026Smart features mention phone music control, weather and offline music, with no calling.

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

No2Owner's manualwww8.garmin.com/manuals/webhelp/GUID-676967A0-1B23-4384-9BC9-76F3D643F1C8/EN-US/Forerunner_255_OM_EN-US.pdfRead 11 October 2026Specifications page 101 lists music media storage for Forerunner music watches (Forerunner 255 Music). This model is the non-music watch.

Yes1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Load music onto the watch and play it from the watch.3Owner's manualns.suunto.com/Manuals/Suunto_Run_2/Userguides/Suunto_Run_2_UserGuide_EN.PDFRead 14 October 2026Media player offline mode plays MP3, FLAC, WAV and AAC files stored on the watch through paired Bluetooth headphones.

Controls

5 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.

52Owner's manualwww8.garmin.com/manuals/webhelp/GUID-676967A0-1B23-4384-9BC9-76F3D643F1C8/EN-US/Forerunner_255_OM_EN-US.pdfRead 11 October 2026Overview, page 2: LIGHT, UP, DOWN, BACK and START/STOP.

23Owner's manualns.suunto.com/Manuals/Suunto_Run_2/Userguides/Suunto_Run_2_UserGuide_EN.PDFRead 14 October 2026Touch screen and buttons: a touch screen, a crown (the middle button) and two additional buttons. The crown is excluded from the button count.

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

LIGHT, UP, DOWN, BACK, START/STOP2Owner's manualwww8.garmin.com/manuals/webhelp/GUID-676967A0-1B23-4384-9BC9-76F3D643F1C8/EN-US/Forerunner_255_OM_EN-US.pdfRead 11 October 2026Overview page 2. START and STOP share one button.

Upper button, Lower button3Owner's manualns.suunto.com/Manuals/Suunto_Run_2/Userguides/Suunto_Run_2_UserGuide_EN.PDFRead 14 October 2026Upper button and Lower button. Tom's Guide calls the crown a digital dial.

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

None2Owner's manualwww8.garmin.com/manuals/webhelp/GUID-676967A0-1B23-4384-9BC9-76F3D643F1C8/EN-US/Forerunner_255_OM_EN-US.pdfRead 11 October 2026Overview shows five buttons and no crown.

Rotating3Owner's manualns.suunto.com/Manuals/Suunto_Run_2/Userguides/Suunto_Run_2_UserGuide_EN.PDFRead 14 October 2026Crown/middle button: turn to move in displays and menus, press to select.

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

None2Owner's manualwww8.garmin.com/manuals/webhelp/GUID-676967A0-1B23-4384-9BC9-76F3D643F1C8/EN-US/Forerunner_255_OM_EN-US.pdfRead 11 October 2026Overview shows five buttons and no rotating bezel.

Not available

Gestures

Raise and turn your arm to turn on the backlight2Owner's manualwww8.garmin.com/manuals/webhelp/GUID-676967A0-1B23-4384-9BC9-76F3D643F1C8/EN-US/Forerunner_255_OM_EN-US.pdfRead 11 October 2026Backlight settings: Gesture turns on the backlight by raising and turning your arm to look at your wrist.

Raise to wake display3Owner's manualns.suunto.com/Manuals/Suunto_Run_2/Userguides/Suunto_Run_2_UserGuide_EN.PDFRead 14 October 2026Display settings include Raise to wake.

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.

Not available

380mAh1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026The What's New table lists 380 mAh against 295 mAh for Suunto Run, and the page says 29% more battery capacity. The safety guide gives a 3.87 V battery, so 380 mAh is about 1.47 Wh.

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.

AGarmin Forerunner 255

Mode	With solar	Hours (h)
Smartwatch	No	336
GPS	No	30
GPS, all systems	No	25
GPS, dual-band	No	16

Source1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Smartwatch mode up to 14 days (336 h). GPS-only GNSS up to 30 h. All-Systems GNSS up to 25 h. All-Systems plus Multi-Band up to 16 h. Manual footnote: smartwatch mode includes activity tracking, phone notifications and wrist heart rate.

BSuunto Run 2

Mode	With solar	Hours (h)
Smartwatch	No	312
Time only	No	360
GPS, dual-band	No	24
GPS, dual-band, always-on display	No	18
GPS, all systems	No	30
GPS, power saving	No	40

Source1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Specifications > Battery life: all-systems GNSS with multi-band up to 24 h (18 h with always-on display), all-systems single-band up to 30 h, power saving GNSS modes up to 40 h, smartwatch mode up to 13 days, standby time mode only up to 15 days. Days are converted to hours exactly. The headline says 10 days of daily training use, a separate claim whose conditions are not stated, so it is not stored. Tom's Guide lists 24 h as multi-band always-on, which conflicts with the maker's 18 h always-on figure, so the maker table is followed. The three battery modes are Performance (default), Endurance and Power saving. They map to the 24 h, 30 h and 40 h rows as in the maker's all-modes line.

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

312h=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.

Not available

Not available

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.

30h=CalculatedFrom Claimed battery life

Not available

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

No9Reviewdcrainmaker.com/2022/06/garmin-forerunner-multisport.htmlRead 11 October 2026Review covers the Forerunner 255, 255S, 255 Music and 255S Music with no solar model. Solar is introduced in this launch only on the Forerunner 955 Solar.

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.

Proprietary plug1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Specs: Garmin proprietary plug charger.

Magnetic puck3Owner's manualns.suunto.com/Manuals/Suunto_Run_2/Userguides/Suunto_Run_2_UserGuide_EN.PDFRead 14 October 2026Safety: the USB cable device connector includes a strong magnet. Alastair Running and Watchnation call it a magnetic puck. The pin layout is not described.

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

Not available

USB-C cable with a magnetic device connector. The safety guide lists charging at USB 5 Vdc, 0.5 A and says to use only the supplied cable. The product page recommends charging at 0 to 35 C, while the non-English sections of the safety guide say 0 to 45 C.4Maker spec sheet (PDF)ns.suunto.com/Manuals/Suunto_Run_2/Safty_and_Regulatory/Run%202%20Safty_and_Regulatory.pdfRead 14 October 2026Battery section: rechargeable lithium-ion, 3.87 Vdc, charging USB 5 Vdc, 0.5 A.

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

Not available

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

Not available

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.

120min2Owner's manualwww8.garmin.com/manuals/webhelp/GUID-676967A0-1B23-4384-9BC9-76F3D643F1C8/EN-US/Forerunner_255_OM_EN-US.pdfRead 11 October 2026Tips for charging: charging a fully depleted battery takes up to two hours, from a Garmin approved AC adapter or a computer USB port. Stored as a nominal claim of 120 minutes with the up-to qualifier.

Not available

Measured

None of 4 known

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

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.

Not available

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.

Not available

Not available

Strap

3 of 6 differ

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 pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Specs: quick release bands, 22 mm, industry standard.

22mm1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Specifications > General: strap width 22 mm.

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

Yes1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026

Yes9Reviewalastairrunning.com/suunto-run-2-reviewRead 14 October 2026The review describes a 22 mm quick-release silicone strap. The maker says only that the strap can be replaced with other compatible options. Watchnation also says quick-release.

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

Industry standard 22 mm quick release bands1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026

22 mm straps1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Strap width 22 mm. The page says the strap can be replaced with other compatible options. No attachment system name is published.

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

Silicone1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Specs: Strap material silicone.

Silicone1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Strap material silicone.

Strap

Not available

Suunto 22mm Athletic 6 Silicone Strap (S/M)1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026In the Box: Suunto 22mm Athletic 6 Silicone Strap for Sizes (S/M). The strap colour follows the watch colour.

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

AGarmin Forerunner 255

Wrist (min) (mm)	Wrist (max) (mm)
130	205

Source1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Specs: fits wrists with a circumference of 130-205 mm. This is the overall range for the watch with its supplied silicone strap.

BSuunto Run 2

Size	Wrist (min) (mm)	Wrist (max) (mm)
S/M	130	200

Source1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026Specifications: wrist sizes 130-200 mm. The box strap is the S/M size. The range is the maker's wrist size for the watch and is assigned to the S/M strap.

Regulatory

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FCC ID

Not available

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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

1.295W/kg4Maker spec sheet (PDF)ns.suunto.com/Manuals/Suunto_Run_2/Safty_and_Regulatory/Run%202%20Safty_and_Regulatory.pdfRead 14 October 2026FCC SAR section: highest reported SAR 1.295 W/kg (wrist), with an accessory that contains no metal at a minimum of 0 mm. This is the US regime.

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

1.498W/kg4Maker spec sheet (PDF)ns.suunto.com/Manuals/Suunto_Run_2/Safty_and_Regulatory/Run%202%20Safty_and_Regulatory.pdfRead 14 October 2026CE SAR section: minimum distance 0 mm from the wrist and highest reported SAR 1.498 W/kg (wrist). This is the EU regime.

Other certifications

ANT+ certified2Owner's manualwww8.garmin.com/manuals/webhelp/GUID-676967A0-1B23-4384-9BC9-76F3D643F1C8/EN-US/Forerunner_255_OM_EN-US.pdfRead 11 October 2026Front matter: this product is ANT+ certified.

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In the box

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In the box

Forerunner 255, Charge/data cable, Documentation1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026In the Box tab: Forerunner 255, charge/data cable, documentation.

Suunto Run 2 Watch, Suunto 22mm Athletic 6 Silicone Strap for Sizes (S/M), Quick Guide, USB-C Charging Cable, Product Safety & Regulatory Information International Limited Warranty1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026In the Box list, verbatim.10Retailer pagewatchnation.com/blogs/news/suunto-run-2-what-new-what-s-in-the-box-and-everything-you-need-to-knowRead 14 October 2026Retailer blog on the box: watch, 22 mm silicone strap in S/M size, USB-C cable with magnetic charging puck, Quick Guide and regulatory documents. Matches the maker's list.

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

No1Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026Box lists a charge/data cable and no power adapter.

No1Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026The box has a USB-C charging cable and no mains or USB power adapter.

Links

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Product page

www.garmin.com/en-US/p/780139/pn/010-02641-011Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026US store page for SKU 010-02641-01.

www.suunto.com/en-us/Products/sports-watches/suunto-run-21Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026

Spec sheet

www.garmin.com/en-US/p/780139/pn/010-02641-011Maker product pagegarmin.com/en-US/p/780139/pn/010-02641-01Read 11 October 2026The specs tab of the US product page holds the full specification list for the 46 mm watch.

www.suunto.com/en-us/Products/sports-watches/suunto-run-21Maker product pagesuunto.com/en-us/Products/sports-watches/suunto-run-2Read 14 October 2026

Manual

www8.garmin.com/manuals/webhelp/GUID-676967A0-1B23-4384-9BC9-76F3D643F1C8/EN-US/Forerunner_255_OM_EN-US.pdf2Owner's manualwww8.garmin.com/manuals/webhelp/GUID-676967A0-1B23-4384-9BC9-76F3D643F1C8/EN-US/Forerunner_255_OM_EN-US.pdfRead 11 October 2026

ns.suunto.com/Manuals/Suunto_Run_2/Userguides/Suunto_Run_2_UserGuide_EN.PDF3Owner's manualns.suunto.com/Manuals/Suunto_Run_2/Userguides/Suunto_Run_2_UserGuide_EN.PDFRead 14 October 2026Suunto Run 2 User Guide PDF, dated 2026-07-29. It matches the online guide pages under suunto.com/Support. Its CE section prints OW234, which is not used.

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.

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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.

1year5Maker product pagegarmin.com/en-US/legal/consumer-limited-warrantyRead 11 October 2026Garmin consumer limited warranty, US: non-aviation products are free from defects in materials or workmanship for one year from the date of purchase.

2years4Maker spec sheet (PDF)ns.suunto.com/Manuals/Suunto_Run_2/Safty_and_Regulatory/Run%202%20Safty_and_Regulatory.pdfRead 14 October 2026International Limited Warranty: two years for watches from the date of original retail purchase. Accessories such as straps, chargers and cables have one year. Mandatory national consumer rights are separate.

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