Smartwatches / Compare

Amazfit T-Rex 3 Pro vs Garmin fēnix 8 Pro

A

Product A: Amazfit

T-Rex 3 Pro

86 of 150 known

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B

Product B: Garmin

fēnix 8 Pro

88 of 150 known

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Every value links to where we found it.

Only differences

AAmazfit T-Rex 3 Pro

BGarmin fēnix 8 Pro

General

5 of 10 differ

Series

T-Rex1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Amazfit T-Rex family. The page compares it with the T-Rex 3, T-Rex Ultra 2 and T-Rex Dual Solar.

fēnix1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Garmin fēnix series.

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

W2549GL5N, W2549GL1N, W2549GL2N, W2444OV1N, W2444OV5N1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026US store variant SKUs: W2549GL5N Tactical Black 44 mm, W2549GL1N Black Gold 44 mm, W2549GL2N Arctic Gold 44 mm, W2444OV1N Tactical Black 48 mm and W2444OV5N Black Gold 48 mm. The German store uses other SKUs.2Maker product pageus.amazfit.com/products/t-rex-3-pro.jsonRead 15 October 2026Store feed variant SKUs by colour and size.

010-03198-00, 010-03198-10, 010-03199-00, 010-03199-101Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Part numbers on the US pages: 010-03198-00 and 010-03198-10 (47 mm), 010-03199-00 and 010-03199-10 (51 mm). The manual lists M/N A04807, A04809 and A05201 for the series without saying which size each is, so they are not stored. The 51 mm MicroLED (010-03380-00) is a separate display type and is left out.

GTIN / EAN

850071618594, 850071618679, 850071618631, 6972596109655, 6972596109549, 6972596109440, 6972596109280, 69725961093581Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026The US store lists 850071618594 for Tactical Black 48 mm, 850071618679 for Black Gold 44 mm and 850071618631 for Arctic Gold 44 mm. The German store EANs are on the German store feed.2Maker product pageus.amazfit.com/products/t-rex-3-pro.jsonRead 15 October 2026Store feed barcodes. Only three of the five options carry a barcode.5Maker product pagede.amazfit.com/products/t-rex-3-pro.jsonRead 15 October 2026German store feed EANs: 6972596109655 Tactical Black 44 mm, 6972596109549 Black Gold 44 mm, 6972596109440 Arctic Gold 44 mm, 6972596109280 Tactical Black 48 mm and 6972596109358 Black Gold 48 mm. These belong to the German store SKUs, so no variant row carries them.

Not available

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

5 September 20257Press releasezepp.com/press-release/amazfit-t-rex-3-pro-smartwatch-launches-featuring-a-rugged-titanium-design-and-integrated-flashlightRead 15 October 2026Release dated 5 September 2025 as the new T-Rex 3 Pro.

3 September 20254Press releasegarmin.com/en-US/newsroom/press-release/wearables-health/introducing-fenix-8-pro-the-first-ever-smartwatches-from-garmin-with-inreach-technology-for-satellite-and-cellular-connectivityRead 13 October 2026Dated Olathe, Kan., 3 September 2025.

Status

Available1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Store lists all five options at 399.99 USD and the add to cart button is active.

Available1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026US pages show Add to Cart with 1-3 business day shipping on the access date.

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

Not available

Not available

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

Not available

Garmin fēnix 9 Pro5Spec databasethe5krunner.com/specs/garmin/fenix-8-proRead 13 October 2026Page names the fēnix 9 Pro as the successor.6Spec databasethe5krunner.com/specs/garmin/fenix-9-proRead 23 October 2026the5krunner's spec page lists the Fenix 8 Pro as the predecessor of the Fenix 9 Pro and its Fenix 8 Pro page lists the Fenix 9 Pro as the successor.7Reviewmightygadget.com/garmin-fenix-9-pro-vs-fenix-8-proRead 23 October 2026Mighty Gadget calls the Fenix 8 Pro the direct predecessor of the Fenix 9 Pro and the outgoing Fenix 8 Pro.

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

$3992Maker product pageus.amazfit.com/products/t-rex-3-pro.jsonRead 15 October 2026Feed lists 399.99 USD for every option. The launch press release says 399.00 USD, which is the stored value.7Press releasezepp.com/press-release/amazfit-t-rex-3-pro-smartwatch-launches-featuring-a-rugged-titanium-design-and-integrated-flashlightRead 15 October 2026Available for 399.00 USD on Amazfit.com and Amazfit retail partners. The Amazfit store now lists 399.99 USD. Prices exclude sales tax.

$1,199.991Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026The Garmin US pages list a lower current price (1,099.99 USD for 47 mm and 1,199.99 USD for 51 mm). Launch prices are from the press release and the5krunner.4Press releasegarmin.com/en-US/newsroom/press-release/wearables-health/introducing-fenix-8-pro-the-first-ever-smartwatches-from-garmin-with-inreach-technology-for-satellite-and-cellular-connectivityRead 13 October 2026The AMOLED fēnix 8 Pro comes in 47 mm and 51 mm and starts at 1,199.99 USD. The 51 mm price is from the5krunner. US price excludes sales tax.5Spec databasethe5krunner.com/specs/garmin/fenix-8-proRead 13 October 2026Launch prices 1,199.99 USD for 47 mm AMOLED and 1,299.99 USD for 51 mm AMOLED.

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.

€399.94Maker product pagede.amazfit.com/products/t-rex-3-proRead 15 October 2026Amazfit Germany lists 399.90 EUR including VAT for both sizes. This is the current store price and it matches the launch price reported by nextpit.11Spec databasenextpit.de/smartwatches/amazfit-t-rex-3-pro-48-mmRead 15 October 2026UVP 399.90 EUR and market start September 2025, listed for the 48 mm model. The 44 mm page lists the same UVP.

Not available

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

Not available

Not available

ColoursiThe maker's own colour names

Tactical Black, Black Gold, Arctic Gold1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Spec table: 48 mm Tactical Black and Black Gold. 44 mm Arctic Gold and Black Gold. The store also sells Tactical Black in 44 mm.

Carbon Gray DLC Titanium with Black/Pebble Gray Silicone Band, Titanium with Graphite/Black Silicone Band1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Variation names without the leading Sapphire. The Carbon Gray DLC Titanium and Titanium names are the SKU variations on the US page.

Segment

Outdoor1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Amazfit sells it as a rugged outdoor smartwatch.

Outdoor1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Garmin sells it as a premium multisport 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.

44, 48mm1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Two case sizes, 44 mm and 48 mm, sold as one product. Base values below describe the 44 mm case.7Press releasezepp.com/press-release/amazfit-t-rex-3-pro-smartwatch-launches-featuring-a-rugged-titanium-design-and-integrated-flashlightRead 15 October 2026Available in two case sizes, 48 mm and 44 mm.

47, 51mm1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

Case shape

Round1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026The display is round and the product images show a round case with an octagonal bezel.

Round1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

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 materials1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Body material: case in fiber-reinforced polymer. Bezel and buttons in Grade 5 titanium. Stored as mixed.

Fibre-reinforced polymer1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026General: case material fiber-reinforced polymer with titanium rear cover. Bezel material titanium. The Carbon Gray DLC variation names a DLC titanium finish.

Case material (as published)

Fiber-reinforced polymer case with Grade 5 titanium bezel and buttons1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026

Fiber-reinforced polymer with titanium rear cover and titanium bezel1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

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

Not available

Titanium rear cover1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

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

Height44.8Width44.8Thickness13.2mm(1.8 × 1.8 × 0.5 in)1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Dimensions without heart rate base: 48 mm 48 x 48 x 14 mm and 44 mm 44.8 x 44.8 x 13.2 mm. The thickness leaves out the sensor base.

Height47Width47Thickness16mm(1.9 × 1.9 × 0.6 in)1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Physical size 47 x 47 x 16 mm on the 47 mm page and 51 x 51 x 16.5 mm on the 51 mm page. The page does not say whether the sensor bump is included.2Maker product pagegarmin.com/en-US/p/1703902Read 13 October 2026Physical size 51 x 51 x 16.5 mm.

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

46.8g(1.7 oz)1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Weight without strap: 48 mm 52 g and 44 mm 46.8 g.

56g(2 oz)1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Weight 77 g (case only: 56 g) for 47 mm. 51 mm lists 90 g (case only: 65 g).2Maker product pagegarmin.com/en-US/p/1703902Read 13 October 2026Weight 90 g (case only: 65 g).

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

77g(2.7 oz)1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026The 77 g and 90 g totals include the supplied silicone band. The page gives the totals as weight and the case-only figure in brackets.2Maker product pagegarmin.com/en-US/p/1703902Read 13 October 202690 g total with the supplied band.

Durability

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

10ATM1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Water-resistance grade 10 ATM. Note 6 says it is rated to ISO 22810:2010 for 100 m and passed SGS testing.

10ATM1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Water rating 10 ATM. The manual adds 4 ATM dive (EN 13319).3Owner's manualwww8.garmin.com/manuals/webhelp/GUID-EECCAC99-90D6-4AB1-9A3A-EC433D3365E2/EN-US/fenix_8_Series_OM_EN-US.pdfRead 13 October 202610 ATM. The device withstands pressure equal to a depth of 100 m.

Water resistance standard

ISO 22810:20101Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Note 6: according to ISO 22810:2010 the watch achieves 10 ATM.

Not available

Dust and water rating

Not available

Not available

Dive rating

EN13319:2000, ISO 6425:2018, GB/T 18828-20221Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Note 2 names EN13319:2000, ISO 6425:2018 and GB/T 18828-2022, each with report numbers per size.

EN 133191Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Manual specifications: 4 ATM dive (EN 13319), designed to comply with CSN EN 13319.

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

45m1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Page text: certified for diving to a depth of 45 m. The comparison table lists 45 m freediving and scuba.

40m1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Dive activity maximum operating depth 40 meters.

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.

Yes1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Note 1: MIL-STD-810H-2019 data comes from report H202505284651-01EN for 48 mm and H202509017818-01EN for 44 mm. The tests are not listed.

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Overview text says the watch is tested to U.S. military standards for thermal, shock and water resistance. The page names no MIL-STD-810 method numbers.

MIL-STD-810 tests

Not available

thermal, shock, water resistance1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

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

Min-30°C7Press releasezepp.com/press-release/amazfit-t-rex-3-pro-smartwatch-launches-featuring-a-rugged-titanium-design-and-integrated-flashlightRead 15 October 2026The watch can operate in temperatures as low as -30 degrees C. No upper limit is published. The manual limits some functions below -10 degrees C on the watch surface.

Min-20Max45°C3Owner's manualwww8.garmin.com/manuals/webhelp/GUID-EECCAC99-90D6-4AB1-9A3A-EC433D3365E2/EN-US/fenix_8_Series_OM_EN-US.pdfRead 13 October 2026Specifications: operating and storage temperature range -20 to 45 degrees C. Charging range 0 to 45 degrees C.

Display

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Display type

OLED1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026

OLED1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Display type AMOLED. The 51 mm MicroLED is a different display and is not part of this product.

Display type (as published)

AMOLED1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Display material: AMOLED.

AMOLED1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

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

1.32in(3.4 cm)1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Size: 48 mm 1.5 inch and 44 mm 1.32 inch.

1.4in(3.6 cm)1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Display size 1.4 inch (35.56 mm) diameter. The 51 mm AMOLED lists the same display.

Resolution

466 × 466px1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 202648 mm 480 x 480 and 44 mm 466 x 466.

454 × 454px1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

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

353ppi1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026PPI 322 for 48 mm and 353 for 44 mm as published.

Not available

Display area

Not available

Not available

Touchscreen

Yes1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026The manual describes swipe gestures and touch. The spec table row labelled Touchscreen names sapphire glass.6Owner's manualsupport.amazfit.com/en/amazfit_t-rex_3_pro/files/user-manual.pdf.pdfRead 15 October 2026Gestures such as swipe and tap. The touchscreen is switched off during dives.

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

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.

3,000nits1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Peak brightness up to 3,000 nits. Note 16: not supported in low temperature mode or when battery life is below 30%, and needs automatic brightness.

2,000nits5Spec databasethe5krunner.com/specs/garmin/fenix-8-proRead 13 October 2026AMOLED is about 2,000 nits peak (the MicroLED is 4,500 nits). Android Central's comparison also says the fēnix 8 Pro AMOLED reaches 2,000 nits. Garmin's own page states no nit figure. This is a launch claim, not a measurement, and the screen area and mode are not stated.

Minimum brightness

Not available

Not available

Always-on display

Yes6Owner's manualsupport.amazfit.com/en/amazfit_t-rex_3_pro/files/user-manual.pdf.pdfRead 15 October 2026Settings > Display > Always On Display, and an Always-on mode toggle in the Control Center.

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Battery table lists always-on display figures for every mode that supports it.

Display cover

Sapphire1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 20267Press releasezepp.com/press-release/amazfit-t-rex-3-pro-smartwatch-launches-featuring-a-rugged-titanium-design-and-integrated-flashlightRead 15 October 2026Scratch-resistant sapphire glass screen.

Sapphire1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

Display cover (as published)

Sapphire glass1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Screen material: sapphire glass. The features text says scratch-resistant sapphire glass.

Sapphire crystal1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Lens material Sapphire crystal on the 47 mm AMOLED SKUs.

Platform

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Platform

Proprietary1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Zepp OS, Zepp Health's own operating system. The page links to the Zepp OS technology page.

Proprietary1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

OS at launch

Zepp OS 53Maker product pageuk.amazfit.com/products/t-rex-3-proRead 15 October 2026The UK comparison table lists Zepp OS 5 for the T-Rex 3 Pro. The US page now lists Zepp OS 6.4Maker product pagede.amazfit.com/products/t-rex-3-proRead 15 October 2026Specs table lists Zepp OS 5.8Spec databasethe5krunner.com/specs/amazfit/t-rex-3-proRead 15 October 2026Operating system Zepp OS 5.

Not available

Software

Not available

Not available

Latest OS

Zepp OS 61Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026The comparison table on the US page lists OS compatibility Zepp OS 6. The UK page still lists Zepp OS 5.10Press articlegadgetsandwearables.com/2026/07/22/amazfit-t-rex-3-pro-ultra-2-zepp-os-6-updateRead 15 October 2026Article of 22 July 2026: Zepp OS 6 rolls out to the T-Rex 3 Pro, with firmware 6.2.104.6 in the screenshot.

Not available

Works with

iOS, Android1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 20266Owner's manualsupport.amazfit.com/en/amazfit_t-rex_3_pro/files/user-manual.pdf.pdfRead 15 October 2026Pairs with the Zepp App on Android or iOS.

iOS, Android1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

Phone requirement

Android 7.0 and above, iOS 15.0 and above, with the Zepp App1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Supported devices: Android 7.0 and above, iOS 15.0 and above. Application: Zepp App.6Owner's manualsupport.amazfit.com/en/amazfit_t-rex_3_pro/files/user-manual.pdf.pdfRead 15 October 2026Manual: the phone must run Android 7.0 or iOS 15.0 or later.

Not available

App store

Yes6Owner's manualsupport.amazfit.com/en/amazfit_t-rex_3_pro/files/user-manual.pdf.pdfRead 15 October 2026Apps can be installed from the app store in the Zepp App.

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

Voice assistants

Zepp Flow1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026AI assistant: Zepp Flow, in select countries and regions.

Voice Commands, Phone Assistant1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Voice command and Bluetooth phone calling with voice assistant support are in the specification list. The two names describe those entries.

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.

Not available

32GB1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

Health sensors

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Heart rate sensor

BioTracker 6.0 PPG biometric sensor (5PD + 2LED)1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Health sensor: BioTracker 6.0 PPG biometric sensor (5PD + 2LED).

Garmin Elevate wrist heart rate monitor1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Garmin Elevate wrist heart rate monitor. The page names no generation.

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

Not available

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Garmin ECG app. Needs an eligible country and a paired phone. Records an ECG similar to a Lead I ECG and detects signs of AFib.

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

Yes1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 202624 hour and manual blood-oxygen saturation. Not a medical device.

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

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

Yes1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 202624H monitoring lists skin temperature (thermometer).

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Skin temperature is in the Health and Wellness list.

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

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Accelerometer

Yes1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

Accelerometer range

Not available

Not available

Gyroscope

Yes1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

Barometric altimeter

Yes1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

Compass

Yes1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Outdoor tools list Compass and the movement sensors include a geomagnetic sensor.

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

Ambient light sensor

Yes1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Movement sensors list an ambient light sensor.

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

Depth gauge

Yes1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026The comparison table lists scuba and freediving with dive depth. The manual states the maximum measurement depth.6Owner's manualsupport.amazfit.com/en/amazfit_t-rex_3_pro/files/user-manual.pdf.pdfRead 15 October 2026Technical specifications in the diving section state the maximum measurement depth.

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

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

45m1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026See the manual for the 45 m maximum measurement depth.6Owner's manualsupport.amazfit.com/en/amazfit_t-rex_3_pro/files/user-manual.pdf.pdfRead 15 October 2026Maximum measurement depth: 45 m / 147.6 ft. Accuracy follows EN13319.

40m1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

Water temperature sensor

Not available

Not available

Health and fitness

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

Continuous heart rate, Heart rate alerts, Blood oxygen app, Heart rate variability, Sleep tracking, Sleep stages, Stress tracking, Readiness score1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 202624 hour heart rate, blood oxygen and stress, abnormal high and low heart rate alerts, sleep heart rate variability, sleep stages including REM, and HybridCharge energy score. Not medical devices.

Continuous heart rate, Heart rate alerts, ECG app, Blood oxygen app, Heart rate variability, Sleep tracking, Sleep stages, Stress tracking, Readiness score, Cycle tracking1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Heart rate every second, high and low abnormal heart rate alerts, ECG app, Pulse Ox, HRV status, advanced sleep with sleep stages, all-day stress, training readiness and women's health. Pulse Ox is not available in every country.

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, Strength rep counting, Interval workouts, Route navigation, Turn-by-turn navigation, Trackback, Golf courses, Ski resort maps1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Smart recognition of 8 sports movements, VO2 Max, Training Load, recovery, pool and open-water swim, strength training with recognition of 25 movements, interval training, offline maps, turn-by-turn directions, direct return navigation and ski resort maps. The FAQ says Golf Mode is supported with golf course maps.6Owner's manualsupport.amazfit.com/en/amazfit_t-rex_3_pro/files/user-manual.pdf.pdfRead 15 October 2026Navigation section: return to the starting point by straight line or by the original route (Backtrack).

VO2 max, Training load, Recovery advice, Running dynamics, Running power, Pool swim, Open water swim, Strength rep counting, Interval workouts, Route navigation, Turn-by-turn navigation, Trackback, Climb detection, Golf courses, Ski resort maps1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026VO2 max, training load, recovery time, running dynamics, running power, pool and open water swim, automatic rep counting, interval training, course guidance and turn-by-turn directions, TracBack, ClimbPro-style live climb information, 43,000 golf courses and ski resort maps.

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

1871Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Technical specifications row: Sports Modes 187. Marketing copy says 180+.

Not available

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

Scuba, single gas, Freedive1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Comparison table: 10 ATM, 45 m freediving, scuba. The FAQ says it suits freediving and recreational scuba diving.6Owner's manualsupport.amazfit.com/en/amazfit_t-rex_3_pro/files/user-manual.pdf.pdfRead 15 October 2026Diving section: the device supports recreational scuba diving and freediving modes. The default gas type is Air and it must not be used for mixed-gas or technical diving.

Scuba, single gas, Freedive1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Spec list: single-gas mode and APNEA mode. No multi-gas or gauge mode is listed.

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 pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Bluetooth peripherals: heart rate belt, running power meter, cycling power meter, cycling speed and cadence sensors and Stryd foot pod. The September 2026 update notes add FTMS indoor bike trainers. Only BLE devices are supported.

Heart rate strap, Power meter, Speed and cadence, Foot pod, Smart trainer1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Specs list HRM accessories, smart trainer control and foot pod capable. Power meter and speed and cadence sensor status appear in the manual sensor pages.

Safety

2 of 6 differ

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

Not available

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.

Not available

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Interactive SOS over satellite and LTE. An active inReach service plan is required.

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

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026LiveTrack and LTE LiveTrack. The LTE function needs an inReach plan.

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

Yes1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Two-color LED flashlight: 200 lux and 300 lux in Boost Mode.7Press releasezepp.com/press-release/amazfit-t-rex-3-pro-smartwatch-launches-featuring-a-rugged-titanium-design-and-integrated-flashlightRead 15 October 2026Dual-color LED flashlight with Boost mode, red light and SOS flash.

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026LED flashlight is in the feature list.

Positioning

1 of 3 differ

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

Not available

GPS, GLONASS, Galileo, QZSS, BeiDou1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Sensors list GPS, GLONASS, Galileo, QZSS and BeiDou with SatIQ technology.

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

Yes1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Positioning: dual-band support and six satellite positioning systems. The page does not name the systems.

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Multi-band GPS is in the feature list.

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

Yes1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Navigation and maps: offline maps supported.

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Built-in mapping with TopoActive maps. The maps tab lists the preloaded maps.

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 pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Connection: Wi-Fi 2.4 GHz, Bluetooth 5.2, BLE.

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

Bluetooth version

5.21Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 20264Maker product pagede.amazfit.com/products/t-rex-3-proRead 15 October 2026Specs table: Bluetooth 5.2 (BLE) and 2.4 GHz Wi-Fi.

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.

Yes1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Connection: Wi-Fi 2.4 GHz and OTA update via Wi-Fi.

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

Wi-Fi standard

Not available

Not available

Wi-Fi bands

2.4 GHz1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 20264Maker product pagede.amazfit.com/products/t-rex-3-proRead 15 October 2026Specs table: 2.4 GHz Wi-Fi.

Not available

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

No1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Connection lists Wi-Fi 2.4 GHz, Bluetooth 5.2 and BLE only. No cellular radio is listed.

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026LTE communication needs an inReach plan. Coverage is not available in all regions.

Network

Not available

LTE1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

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.

Yes3Maker product pageuk.amazfit.com/products/t-rex-3-proRead 15 October 2026The Zepp Pay text says Zepp Pay uses the integrated NFC technology.4Maker product pagede.amazfit.com/products/t-rex-3-proRead 15 October 2026Zepp Pay text names the integrated NFC technology.8Spec databasethe5krunner.com/specs/amazfit/t-rex-3-proRead 15 October 2026Lists NFC for Zepp Pay.

Yes3Owner's manualwww8.garmin.com/manuals/webhelp/GUID-EECCAC99-90D6-4AB1-9A3A-EC433D3365E2/EN-US/fenix_8_Series_OM_EN-US.pdfRead 13 October 2026The wireless frequency table for the fēnix 8 Pro lists 13.56 MHz, the NFC band, and Garmin Pay is in the feature list.

Contactless payments

Yes3Maker product pageuk.amazfit.com/products/t-rex-3-proRead 15 October 2026Zepp Pay binds up to eight bank cards for contactless payment. Note 16 lists 31 supported countries in Europe through Curve and issuer banks. The US page does not mention Zepp Pay.

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

Payment services

Zepp Pay3Maker product pageuk.amazfit.com/products/t-rex-3-proRead 15 October 2026Zepp Pay. Curve and participating issuer banks in 31 European countries.

Garmin Pay1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

Ultra-wideband

Not available

Not available

Satellite

Not available

Emergency SOS, Messaging, Location sharing1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Satellite text messaging, location check-ins and interactive SOS. An inReach plan is required. The US page marks satellite and LTE as plan-based features.

ANT+

No1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Note 15: peripheral connections only support BLE devices. ANT+ is not listed.

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

Audio

1 of 4 differ

Speaker

Yes1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Mic and Speaker: Support.7Press releasezepp.com/press-release/amazfit-t-rex-3-pro-smartwatch-launches-featuring-a-rugged-titanium-design-and-integrated-flashlightRead 15 October 2026Built-in speaker and microphone.

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 20263Owner's manualwww8.garmin.com/manuals/webhelp/GUID-EECCAC99-90D6-4AB1-9A3A-EC433D3365E2/EN-US/fenix_8_Series_OM_EN-US.pdfRead 13 October 2026The manual mentions residual water in the speaker and microphone after swimming.

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 only1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026FAQ: the T-Rex 3 Pro supports Bluetooth phone calls and texts. Calls use the paired phone.

Cellular or phone1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Two-way voice calls over LTE (plan needed). Bluetooth phone calling is also listed.

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

Yes1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Music storage: Support, with a 26 GB shared storage limit. The manual says local music plays through the speaker or Bluetooth headphones.6Owner's manualsupport.amazfit.com/en/amazfit_t-rex_3_pro/files/user-manual.pdf.pdfRead 15 October 2026Music player: plays .mp3 files stored on the watch through the speaker or Bluetooth headphones.

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Spec list: music storage, plays and controls watch music. Music services may need a subscription.

Controls

2 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.

41Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Buttons: 4.6Owner's manualsupport.amazfit.com/en/amazfit_t-rex_3_pro/files/user-manual.pdf.pdfRead 15 October 2026UP, SELECT, BACK and DOWN. UP and DOWN also work as gesture shortcuts.

53Owner's manualwww8.garmin.com/manuals/webhelp/GUID-EECCAC99-90D6-4AB1-9A3A-EC433D3365E2/EN-US/fenix_8_Series_OM_EN-US.pdfRead 13 October 2026Five buttons are described in the Introduction: upper-left, middle-left, lower-left, upper-right and lower-right.

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

UP, SELECT, BACK, DOWN6Owner's manualsupport.amazfit.com/en/amazfit_t-rex_3_pro/files/user-manual.pdf.pdfRead 15 October 2026Upper right SELECT, lower right BACK, plus UP and DOWN.

Upper-left button, Middle-left button, Lower-left button, Upper-right button, Lower-right button3Owner's manualwww8.garmin.com/manuals/webhelp/GUID-EECCAC99-90D6-4AB1-9A3A-EC433D3365E2/EN-US/fenix_8_Series_OM_EN-US.pdfRead 13 October 2026Names are the manual's position labels, because the manual gives no other names.

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

None6Owner's manualsupport.amazfit.com/en/amazfit_t-rex_3_pro/files/user-manual.pdf.pdfRead 15 October 2026No crown is described. Controls are four buttons and the touchscreen.

None3Owner's manualwww8.garmin.com/manuals/webhelp/GUID-EECCAC99-90D6-4AB1-9A3A-EC433D3365E2/EN-US/fenix_8_Series_OM_EN-US.pdfRead 13 October 2026No rotating crown. Control is by five buttons and the touchscreen.

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

None6Owner's manualsupport.amazfit.com/en/amazfit_t-rex_3_pro/files/user-manual.pdf.pdfRead 15 October 2026No rotating bezel is described.

None3Owner's manualwww8.garmin.com/manuals/webhelp/GUID-EECCAC99-90D6-4AB1-9A3A-EC433D3365E2/EN-US/fenix_8_Series_OM_EN-US.pdfRead 13 October 2026No rotating bezel is described.

Gestures

Not available

Not available

Battery and charging

7 of 13 differ

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

500mAh1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Battery capacity: 48 mm 700 mAh and 44 mm 500 mAh, both rated values.

Not available

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

AAmazfit T-Rex 3 Pro

Mode	With solar	Hours (h)
Smartwatch	No	408
Heavy use	No	192
GPS, dual-band	No	26
GPS, power saving	No	51
Extended GPS workout	No	60
Max battery GPS	No	86

Source1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Typical use 25 days (48 mm) and 17 days (44 mm). Heavy use 10 days and 8 days. Accurate GPS mode 38 h and 26 h in the spec table, with heart rate on and dual-frequency, all satellites. Power-saving GPS 74 h and 51 h with single frequency. GPS Long Battery Life 85 h and 60 h and GPS Max Battery Life 116 h and 86 h, both only in Hiking and Climbing sports modes. Low temperature rows are not stored. The comparison table shows 29 h for the 44 mm accurate GPS value. The spec table, feature text and UK page say 26 h, so 26 h is stored. Conditions are in note 8.3Maker product pageuk.amazfit.com/products/t-rex-3-proRead 15 October 2026The UK page gives 26 h for the 44 mm accurate GPS mode, like the US spec table.

BGarmin fēnix 8 Pro

Mode	With solar	Hours (h)
Smartwatch	No	360
Always-on	No	192
Low power	No	456
GPS	No	44
GPS, always-on display	No	33
GPS, all systems	No	34
GPS, all systems, always-on display	No	26
GPS, dual-band	No	30
GPS, dual-band, always-on display	No	23
GPS, dual-band with music	No	13
Max battery GPS	No	70
Expedition	No	336

Source1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 202647 mm: smartwatch 15 days (8 days always-on), battery saver watch mode 19 days, GPS only 44 h (33 h AOD), all satellite systems 34 h (26 h), all systems plus multi-band 30 h (23 h), multi-band plus music 13 h, max battery GPS 70 h, expedition GPS 14 days. Multi-band and music figures assume typical use with SatIQ. The LTE LiveTrack rows (12 h and 8 h) have no matching mode option and are not stored. Days are converted to hours exactly. These are not solar-aided. Row values for 51 mm come from the 51 mm page and the manual.2Maker product pagegarmin.com/en-US/p/1703902Read 13 October 2026Smartwatch 27 days (15 days always-on), battery saver 34 days, GPS only 78 h (56 h), all systems 60 h (47 h), multi-band 53 h (41 h), multi-band plus music 23 h, max battery GPS 123 h, expedition 24 days.3Owner's manualwww8.garmin.com/manuals/webhelp/GUID-EECCAC99-90D6-4AB1-9A3A-EC433D3365E2/EN-US/fenix_8_Series_OM_EN-US.pdfRead 13 October 2026Battery Information table for fēnix 8 Pro 47 mm, 51 mm and MicroLED. The 47 mm and 51 mm columns match the product pages.

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.

408h=CalculatedFrom Claimed battery life

360h=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

192h=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

44h=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.

Not available

Proprietary plug1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Garmin proprietary plug charger. The watch port is Garmin's own.3Owner's manualwww8.garmin.com/manuals/webhelp/GUID-EECCAC99-90D6-4AB1-9A3A-EC433D3365E2/EN-US/fenix_8_Series_OM_EN-US.pdfRead 13 October 2026Your watch comes with a proprietary charging cable.

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

Magnetic charging head. The packing list says no cable is included and the store FAQ says a USB-C cable is not supplied.1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Packing list: magnetic charging head (no cable). FAQ: Amazfit does not include a USB-C cable.

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

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.

Not available

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

4 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.

20mm1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Strap width: 48 mm 22 mm and 44 mm 20 mm.

22mm1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026QuickFit band compatible, included: 22 mm for 47 mm and 26 mm for 51 mm.2Maker product pagegarmin.com/en-US/p/1703902Read 13 October 2026QuickFit band included (26 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 pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Comparison table: strap attachment 22 mm quick release and 20 mm quick release.

Yes1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

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

20 mm quick release on the 44 mm case and 22 mm quick release on the 48 mm case1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Comparison table: strap attachment 22 mm quick release for 48 mm and 20 mm quick release for 44 mm.

QuickFit, 22 mm on the 47 mm case and 26 mm on the 51 mm case1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

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

Silicone1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Strap material: silicone.

Silicone1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

Strap

Not available

Black/Pebble Gray Silicone Band1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

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 T-Rex 3 Pro

Wrist (min) (mm)	Wrist (max) (mm)
140	205

Source1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Min and max wrist dimensions: 48 mm 145 to 210 mm and 44 mm 140 to 205 mm. Buckle: classic pin buckle.

BGarmin fēnix 8 Pro

Size	Wrist (min) (mm)	Wrist (max) (mm)
Silicone band	125	208

Source1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026Fits wrists of 125-208 mm with the silicone band on 47 mm and 127-210 mm on 51 mm.2Maker product pagegarmin.com/en-US/p/1703902Read 13 October 2026Silicone band fits 127-210 mm.

Regulatory

None of 3 known

FCC ID

Not available

Not available

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

Not available

In the box

1 of 2 differ

In the box

Smartwatch (including standard strap), Magnetic charging head (no cable), Instruction manual1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Packing list: smartwatch (including standard strap), magnetic charging head (no cable), instruction manual.

fēnix 8 Pro (47 mm, AMOLED) smartwatch, Charging/data cable, Documentation1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 20262Maker product pagegarmin.com/en-US/p/1703902Read 13 October 2026fēnix 8 Pro (51 mm, AMOLED) smartwatch, charging/data cable, documentation.

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

No1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Only the charging head is supplied. No mains adapter and no cable.

No1Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026In the box: watch, charging/data cable and documentation. No mains adapter.

Links

Not compared

Product page

us.amazfit.com/products/t-rex-3-pro1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026

www.garmin.com/en-US/p/17019211Maker product pagegarmin.com/en-US/p/1701921Read 13 October 2026

Spec sheet

Not available

Not available

Manual

support.amazfit.com/en/amazfit_t-rex_3_pro/files/user-manual.pdf.pdf6Owner's manualsupport.amazfit.com/en/amazfit_t-rex_3_pro/files/user-manual.pdf.pdfRead 15 October 2026Amazfit T-Rex 3 Pro user manual, global version.

www8.garmin.com/manuals/webhelp/GUID-EECCAC99-90D6-4AB1-9A3A-EC433D3365E2/EN-US/fenix_8_Series_OM_EN-US.pdf3Owner's manualwww8.garmin.com/manuals/webhelp/GUID-EECCAC99-90D6-4AB1-9A3A-EC433D3365E2/EN-US/fenix_8_Series_OM_EN-US.pdfRead 13 October 2026fēnix 8 Series owner's manual. It covers the AMOLED, Solar, Pro and MicroLED models.

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

1 of 1 differ

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

1year1Maker product pageus.amazfit.com/products/t-rex-3-proRead 15 October 2026Store footer says 1 Year Warranty. This is the US store.

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