Amazfit T-Rex 3 Pro (Black, 44mm)

Amazfit T-Rex 3 Pro (Black, 44mm)

By Amazfit · Fitness Trackers · Phones & Computers

  • 1.32 in AMOLED display
  • 10 ATM water rating
  • 640 mAh battery (44 mm)
  • sapphire glass
  • titanium bezel

Lowest price seen
~$399.99 (approx.)
from $399.99 at Amazon

Prices are snapshots. Check the current price with the store.

Summary

A rugged outdoor GPS smartwatch with a 3000-nit sapphire AMOLED, Grade 5 titanium bezel and a manufacturer-rated 17-day battery, built for hikers and runners who want Fenix-class hardware without the Fenix price. Check the navigation software before you buy: multiple reviewers found route guidance unreliable as of early 2026.

Strengths

  • Sapphire glass and Grade 5 titanium are materials you normally find on much more expensive outdoor watches.
  • The 3000-nit AMOLED earns repeated praise for outdoor visibility.
  • Battery life is the most consistently praised owner attribute, with multi-week real-world endurance reported.
  • Dual-band GPS is praised for accuracy, including in high-rise urban canyons.
  • It undercuts the Garmin Fenix 8 and Enduro 3 on price while matching core outdoor features.

Weaknesses

  • Route guidance is the weak point: WIRED saw navigation fail about 90% of attempts, and a December 2025 firmware update left full auto-rerouting untested.
  • There is no Wear OS or Google Play app support, the most common structural complaint.
  • Zepp Pay does not work in the United States, confirmed by both WIRED and Wareable.
  • Heart-rate accuracy is activity- and fit-dependent, and Zepp Flow responses can lag up to 8 seconds.
  • The 44 mm case is still a large watch, and the USB-C charging cable is not in the box.
  • The Zepp app and watch software are described as confusing to customize, with no clear timelines for fixes.

Verified specifications

Display1.32 in AMOLED, 466 × 466 px, 353 PPI, up to 3000 nits peak brightness, sapphire glass.
Case44.8 × 44.8 × 13.2 mm fiber-reinforced polymer, Grade 5 titanium bezel and buttons.
Weight46.8 g without the strap.
Battery500 mAh rated per Amazfit’s official pages; Android Police lists 640 mAh, an unresolved conflict.
Battery life (44 mm)up to 17 days typical, 8 days heavy use, 26 h accurate GPS, 51 h power-saving GPS, 60 h GPS long battery life, 86 h GPS max battery life.
Low-temperature mode (44 mm)14 h with GPS on, 14 days with GPS off.
Water and dive10 ATM per ISO 22810:2010 (100 m static); certified to 45 m for freediving and recreational scuba (EN13319, ISO 6425).
DurabilityMIL-STD-810H-2019 per Amazfit’s spec sheet; Android Police could not verify military-standard credentials.
GPSdual-band, six satellite systems, circularly-polarized antenna.
Health sensorsBioTracker 6.0 PPG (5PD + 2LED), SpO2, skin temperature, barometric altimeter, geomagnetic, gyroscope, accelerometer, ambient light.
Sports modes180+.
ConnectivityBluetooth 5.2 BLE, Wi-Fi 2.4 GHz, NFC (Zepp Pay).
Callingspeaker and microphone; Bluetooth calling supported.
Flashlighttwo-color LED, 200 lux with Boost and SOS modes.
Storageup to 26 GB usable for maps, music and data.
Strap20 mm quick-release.
OSZepp OS 5; works with Android 7.0+ and iOS 15.0+.
In the boxwatch body, charging puck, strap, quick-start manual; USB-C charging cable not included.
Full research notes and sources

Battery life and charging

Amazfit rates the 44 mm at up to 17 days of typical use, 8 days of heavy use, 26 hours with accurate GPS on, and 14 days in low-temperature mode with GPS off. Consumer Reports ran the watch through its smartwatch lab protocol and measured 494 hours, about 20.6 days, of typical use, with a 124-minute full charge; the display passed a scratch test and the case passed a dunk test. Wareable’s real-world test, on the larger 48 mm, saw 18 days per charge with about 14 hours of accurate GPS, a 5-hour hike using 17% and a 30-minute run about 2%. On r/amazfit, battery life is the most consistently praised attribute, with owners reporting multi-week endurance.

Navigation is the most consequential caveat. WIRED’s 3/10 review, “An Outdoor Watch That Doesn’t Work,” reported route navigation failing about 90% of attempts and once advised running on Interstate 405; a Zepp Coach run froze with a “Training Completed” trophy one mile in, and downloading maps took five minutes for one-third of Los Angeles. Wareable found auto-rerouting undelivered — only route-deviation alerts worked — and a December 2025 firmware update (v4.1.6.7) refined deviation handling, though full re-routing remained untested as of the February 2026 review. Android Police called the map download process messy and time-consuming.

Sensors, software and Zepp OS

The BioTracker 6.0 PPG sensor (5PD + 2LED) tracks heart rate, SpO2 and skin temperature, alongside a barometric altimeter, geomagnetic sensor, gyroscope, accelerometer and ambient light sensor. Heart-rate accuracy is activity- and fit-dependent: one owner reported accuracy close to a Polar H10 chest strap during weightlifting when the watch was worn higher and tighter, while a 6-month review of the non-Pro T-Rex 3 reported consistently inaccurate readings. Wareable called heart rate “pretty good” against the Coros Nomad, Coros Pace 3 and Garmin Fenix 8, and Consumer Reports rated fitness tracking excellent for heart-rate measurement, with GPS among the most accurate.

Zepp OS 5 means no Google Play or Wear OS apps, the most common structural complaint among reviewers. The speaker and microphone support Bluetooth calling, but TechAdvisor notes feature support — contactless payments, Zepp Flow AI — varies by the paired phone, and WIRED reported Zepp Flow responses lagging up to 8 seconds or not arriving. Wareable found the workout start and end voice announcements cannot be turned off, unlike on the T-Rex 3. The two-color LED flashlight, specified at 200 lux with Boost and SOS modes, earned praise from both WIRED and Wareable. Isolated owner complaints on Amazfit’s own collection pages include a stock strap that barely fit, MP3 downloads that repeatedly failed, and a Zepp Flow widget stuck in Spanish while the rest of the watch was in English. The Aura Wellness Advisor add-on, which unlocks in-depth sleep reports, assessment and relaxation tools, requires a monthly or annual subscription.

Is it worth it?

Amazfit launched the T-Rex 3 Pro at $399.99 in September 2025, the same price for both case sizes; TechAdvisor’s review carried a $379 price, and REI lists the watch at $400.00. At $350 or less it is a strong buy for outdoor use — sapphire, Grade 5 titanium, the 3000-nit display and dual-band GPS undercut the Fenix class on price. At the launch price the value is fair, with the buyer paying for rugged hardware rather than a polished smart platform; above $400 the value is weak. Wareable’s launch coverage put the Garmin Fenix 8 from $999 and the Enduro 3 at $899.99, with Suunto’s Vertical 2 about $300 more and Coros’ Nomad cheaper but lacking the AMOLED display, flashlight and premium materials. Two costs to plan for: the USB-C cable is not in the box, and the Aura Wellness Advisor sleep features need a paid subscription. If offline routing matters to you, wait for proof the navigation software works — that is the deciding factor at any price.

Which model this is

This page covers the Amazfit T-Rex 3 Pro with the 44 mm case in Tactical Black, announced in September 2025 as the successor to the T-Rex 3. Amazfit sells two case sizes — 48 mm with a 1.5 in display and 44 mm with a 1.32 in display — and the 44 mm comes in Tactical Black, Black Gold and Arctic Gold. Do not confuse it with the non-Pro T-Rex 3, which uses Gorilla Glass, a 2000-nit display and has no speaker, or with the older T-Rex 2 and T-Rex Ultra lines. The 44 mm takes a 20 mm quick-release strap, not the 22 mm strap of the 48 mm. The US listing is ASIN B0G2D39481.

Sources

Manufacturer:

Independent reviews:

Owner reports:

Parts and stores:

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