Fitness watches · Model guide · Maker specs
Amazfit T-Rex 3
If you want a rugged watch with offline maps for under $300, buy Amazfit T-Rex 3: $279.99 for dual-band GPS and about 27 days of battery.
In short
If you want a rugged watch with offline maps for under $300, buy Amazfit T-Rex 3: $279.99 for dual-band GPS and about 27 days of battery. It has a 2,000-nit AMOLED, 4GB for maps and podcasts, 10 ATM, and Amazfit's rating for recreational dives to 147 feet. T-Rex 3 Pro adds a 44mm size and comes with published GPS battery ratings.
Product images
Amazfit T-Rex 3, from its Amazon listing.
Credit: Amazon.com (Associates Program). Amazon listing
Product image from the Amazon listing.
Who it is for
- Hikers who navigate by watch. It has offline maps, point-to-point routes you can build on the watch, off-route alerts and dual-band GPS.
- Cold-weather and gloved users. Amazfit gives an operating range of −22°F to 158°F, and Glove Mode works through gloves up to 2mm thick.
- Long trips away from a charger. Amazfit's FAQ puts typical use at about 27 days and battery saver at about 40.
Who should skip it
- Smaller wrists. T-Rex 3 is 48mm only; T-Rex 3 Pro also comes in 44mm.
- Anyone who takes calls on the wrist. Amazfit lists Bluetooth calling for T-Rex 3 Pro, not for T-Rex 3.
What sets it apart
- A longer typical-use rating than its pricier sibling: about 27 days, where the 48mm T-Rex 3 Pro is rated for 25.
- Offline maps, routes you build on the watch, and dual-band GPS across six satellite systems.
- 4GB of storage, which Amazfit says holds up to 100 hours of podcasts alongside your maps.
- 10 ATM (328 feet), with the body and standard strap certified for freediving and recreational diving to 147 feet.
- Glove Mode for gloves up to 2mm thick, and a night display in red, green or orange.
Caveats
- Amazfit doesn't give a weight, a case thickness or a screen resolution for T-Rex 3.
- Amazfit lists no satellite SOS, so off-grid emergencies still depend on your phone or a separate device.
Key specs
In the same order on every watch page, so you can compare models.
| Spec | Value | Source and notes |
|---|---|---|
| Display size | 1.5-inch AMOLED in a 48mm (1.88-inch) case | Amazfit T-Rex 3 product page |
| Display type | AMOLED; night display in red, green or orange; Glove Mode for gloves up to 2mm | Amazfit T-Rex 3 product page |
| Peak brightness | Up to 2,000 nits peak | Amazfit T-Rex 3 product page |
| Case size(s) | 48mm (1.88-inch) only; T-Rex 3 Pro adds a 44mm size | Amazfit T-Rex 3 product page |
| Case material | Amazfit calls the body military-grade; materials not listed | Amazfit T-Rex 3 product page |
| Case dimensions | 48mm (1.88-inch) across; height and thickness not published | Amazfit T-Rex 3 product page |
| Finishes | Tactical Black | Amazfit T-Rex 3 product page |
| On-device storage | 4GB (Amazfit: up to 100 hours of podcasts, plus offline maps) | Amazfit T-Rex 3 product page |
| Battery, typical use | About 27 days typical (Amazfit FAQ); "over 3 weeks" in Amazfit's marketing | Amazfit T-Rex 3 FAQ |
| Battery, saver mode | About 40 days in battery saver | Amazfit T-Rex 3 FAQ |
| Battery, GPS | Accurate, Long Battery Life and Max Battery Life GPS modes; no hour ratings given | Amazfit T-Rex 3 product page |
| Charging | About 3 hours from empty to full (Amazfit FAQ) | Amazfit T-Rex 3 FAQ |
| Water resistance | 10 ATM (328 feet); body and standard strap certified for freediving and recreational diving to 147 feet, per Amazfit | Amazfit T-Rex 3 product page |
| GNSS / GPS | Dual-band; six satellite systems; on-watch point-to-point routes; GPS can be switched off for privacy | Amazfit T-Rex 3 product page |
| Cellular | None; pairs with your phone and Bluetooth earphones | Amazfit T-Rex 3 product page |
| Heart rate | 24/7 heart-rate tracking; alerts for abnormal readings | Amazfit T-Rex 3 product page |
| Blood oxygen (SpO2) | 24/7 blood-oxygen tracking; one-tap measurement of four metrics | Amazfit T-Rex 3 product page |
| Temperature sensing | No wrist-temperature sensor listed | Amazfit T-Rex 3 product page |
| Sleep tracking | Sleep stages, breathing quality, naps and sleep score in the Zepp app | Amazfit T-Rex 3 product page |
| Workout types | Outdoor, trail and treadmill running; strength templates; automatic detection of 25 exercise types; running power, VO₂ Max, recovery, training effect and load | Amazfit T-Rex 3 product page |
| Other sensors | Optical heart-rate and SpO2 sensors; the full sensor list isn't itemized | Amazfit T-Rex 3 product page |
| Durability / ingress | 10 ATM (328 feet); operating range −22°F to 158°F; "military-grade" body per Amazfit, with no MIL-STD test list | Amazfit T-Rex 3 product page |
| Safety / incident alerts | Health alerts for abnormal readings; off-route alerts and voice prompts through Bluetooth earphones; no satellite SOS | Amazfit T-Rex 3 product page |
| Operating system | Zepp OS 4.5 with Zepp Flow voice control (Amazfit says it uses OpenAI GPT-4o) | Amazfit T-Rex 3 product page |
| Phone compatibility | Zepp app on iPhone and Android (Amazfit FAQ); no minimum versions given | Amazfit T-Rex 3 FAQ |
| Wireless (Wi-Fi / Bluetooth) | Bluetooth for phones, earphones and accessories; Wi-Fi not itemized | Amazfit T-Rex 3 product page |
| Band / strap system | 22mm strap; Amazfit's accessory list mixes 20mm and 22mm straps; the standard strap counts toward the 147-foot dive rating | Amazfit T-Rex 3 product page |
| US price | $279.99 on Amazfit's US store (19 September 2026) | Amazfit US store |
| Price band | Rugged value ($250–$300) | Based on the $279.99 US price |
| Announced | 2024 | Amazfit T-Rex 3 product page |
| Availability | In stock at Amazfit's US store on 19 September 2026 | Amazfit US store |
Amazfit T-Rex 3 extras
Specs only this model has.
| Spec | Value | Source and notes |
|---|---|---|
| Sizes in the T-Rex 3 family | T-Rex 3: 48mm only. T-Rex 3 Pro: 44mm or 48mm | Amazfit T-Rex 3 product page |
| Zepp Flow | Voice control for settings, Zepp Coach progress and your readiness score; Amazfit says it runs on OpenAI GPT-4o | Amazfit T-Rex 3 product page |
| Readiness score | Daily physical and mental recovery score in the Zepp app; not the same as Apple's 0–10 readiness score | Amazfit T-Rex 3 product page |
| Dive rating | Body and standard strap certified for freediving and recreational diving to 147 feet (Amazfit) | Amazfit T-Rex 3 product page |
| Phone pairing | Works with iPhone and Android through the Zepp app | Amazfit T-Rex 3 FAQ |
T-Rex 3 or T-Rex 3 Pro?
T-Rex 3 is Amazfit’s 2024 rugged watch. T-Rex 3 Pro costs more and adds a sapphire screen, a titanium bezel, a brighter display, a 44mm option as well as the 48mm, and published GPS ratings. Amazfit also lists a flashlight and Bluetooth calls for the Pro, which T-Rex 3’s specs don’t mention.
What T-Rex 3 keeps is the longer battery rating: Amazfit puts typical use at about 27 days, where the 48mm Pro is rated for 25. It also lists 4GB of storage for maps, a figure the Pro’s specs leave out. If you want sapphire, titanium and GPS numbers you can plan a trip around, pay for the Pro. If maps and weeks between charges are the point, the $279 T-Rex 3 does that for less.
Maps and GPS
Dual-band GPS covers six satellite systems, and the offline maps live on the watch’s 4GB, which Amazfit says also fits up to 100 hours of podcasts. You can build point-to-point routes on the watch, get off-route alerts and voice prompts through Bluetooth earphones, and switch GPS off entirely for privacy.
Battery and charging
| Mode | T-Rex 3 |
|---|---|
| Typical use | About 27 days |
| Battery saver | About 40 days |
| Accurate, Long Battery Life and Max Battery Life GPS | Not published |
| Full charge | About 3 hours |
The typical-use and saver figures come from Amazfit’s FAQ; its marketing rounds typical use to “over 3 weeks”. Without GPS ratings, you’ll have to learn the watch’s GPS stamina on your own trips before you rely on it for a long one.
Cold, water and gloves
Amazfit rates T-Rex 3 to work from −22°F to 158°F and calls the body military-grade, without naming the MIL-STD tests behind that. It’s water resistant to 10 ATM, Glove Mode works through gloves up to 2mm thick, and the night display can switch the screen to red, green or orange for use in the dark.
Health and training
Heart rate and blood oxygen are tracked around the clock, with alerts for abnormal readings, and one tap measures four metrics at once. Sleep tracking covers stages, breathing quality, naps and a sleep score. For workouts, Amazfit lists outdoor, trail and treadmill running, strength templates, automatic detection of 25 exercise types, running power, VO₂ Max, recovery and training load.
Price
Amazfit’s US store still had T-Rex 3 in stock at $279.99 on 19 September 2026. Check Amazon’s price against that before you buy.
Sources
- Amazon product listing — accessed 2026-09-20
- Amazfit US — T-Rex 3 product page and FAQ — accessed 2026-09-19
Frequently asked questions
How long does T-Rex 3 last with GPS on?
Amazfit doesn't say. It names three GPS modes, Accurate, Long Battery Life and Max Battery Life, but gives no hours for any of them. T-Rex 3 Pro does come with GPS ratings.
How deep is T-Rex 3 rated for diving?
To 147 feet, Amazfit says: the body and standard strap are certified for freediving and recreational diving that deep, and the watch is rated 10 ATM (328 feet).
Can I use T-Rex 3 with an iPhone?
Yes. It pairs through the Zepp app on iPhone or Android, though Amazfit gives no minimum iOS or Android version for it.
What does Zepp Flow do?
It's Amazfit's voice control on Zepp OS 4.5. You can change settings and ask about your Zepp Coach progress or readiness score by speaking, and Amazfit says it uses OpenAI's GPT-4o.
Official product page: Amazfit T-Rex 3. Tech specs: Amazfit T-Rex 3 specs.