The Amazfit T-Rex 3 Pro is sold in two sizes, 48mm and 44mm, and the choice changes more than the case width. Battery capacity, screen size, weight and strap width all move with it, while the sensors, the titanium bezel, the sapphire glass and the outdoor features stay the same. The unit sold here is the 48mm Amazfit T-Rex 3 Pro, measuring 48 x 48 x 14 mm and weighing 52 g without the strap. Below, the figures Amazfit publishes for each size sit side by side, so you can judge whether the larger watch suits your wrist and the way you train.
Table of Contents
Battery: where the two sizes differ most
Amazfit rates the 48mm Amazfit T-Rex 3 Pro at 700 mAh and the 44mm at 500 mAh, both as rated values. That gap shows up in every mode Amazfit lists: up to 25 days versus 17 days with typical use, up to 10 versus 8 days with heavy use, up to 38 versus 26 hours in Accurate GPS Mode, and up to 74 versus 51 hours in Power-Saving GPS Mode. GPS Long Battery Life Mode reaches up to 85 versus 60 hours, and GPS Max Battery Life up to 116 versus 86 hours; Amazfit notes those last two modes work only in the Hiking and Climbing sport modes. If you plan multi-day treks far from a socket, the 48mm is the safer pick.
Screen and case: size, not quality
The 48mm uses a 1.5-inch AMOLED at 480 x 480 pixels (322 ppi); the 44mm uses a 1.32-inch AMOLED at 466 x 466 (353 ppi). Both reach up to 3,000 nits peak brightness and both sit under sapphire glass, so the smaller screen is actually slightly sharper while the larger one shows more of a map or a workout page at once. The case is fibre-reinforced polymer with a Grade 5 titanium bezel and four titanium buttons on both sizes. Without the strap, the 48mm weighs 52 g and the 44mm 46.8 g, and the 44mm is about 3 mm narrower and 0.8 mm thinner.
Fit, straps and colours
Amazfit ships the 48mm on a 22 mm silicone strap for wrists from 145 to 210 mm, and the 44mm on a 20 mm strap for wrists from 140 to 205 mm, both with a classic pin buckle. Straps are therefore not interchangeable between sizes. Colours also differ by size: Amazfit lists Tactical Black and Black Gold for the 48mm, and Arctic Gold and Black Gold for the 44mm. A practical test before choosing is to measure your wrist: on a wrist under about 160 mm, a 48 x 48 x 14 mm case will look large and may press on the wrist bone when you bend your hand.
What every Amazfit T-Rex 3 Pro shares
Outside battery, screen and size, both versions are the same watch. Each has dual-band positioning across six satellite systems with a circularly polarised antenna, free offline maps with turn-by-turn directions, route planning and auto-rerouting. Water resistance is 10 ATM, and Amazfit states diving suitability to 45 m under EN13319, ISO 6425 and GB/T 18828 testing, with freediving, recreational diving and Auto Dive Detection modes. Both carry a two-colour LED flashlight rated at 200 lux, or 300 lux in Boost Mode, a speaker and microphone for Bluetooth calls, Wi-Fi 2.4 GHz and Bluetooth 5.2.
Health and training tools
On the Amazfit T-Rex 3 Pro, the BioTracker 6.0 PPG sensor (5PD + 2LED) tracks heart rate, blood oxygen, stress and skin temperature around the clock, along with sleep stages including REM, sleep breathing quality and naps. Amazfit counts 187 sport modes, including HYROX race and training modes, and the Zepp Coach plans and PeakBeats workout status run through the Zepp App. Data syncs to Strava, komoot, TrainingPeaks, Apple Health and Google Fit among others. These readings are for wellness trends, not medical diagnosis; a fingertip oximeter or a doctor remains the reference if a figure concerns you.
Low-temperature use
For cold climates and high altitude, Amazfit lists an Ultra-low Temperature Mode tested between -10 and -30 °C. In that mode the 48mm Amazfit T-Rex 3 Pro is rated up to 25 hours with GPS on and up to 25 days with GPS off, against 14 hours and 14 days for the 44mm. Amazfit adds that lithium batteries lose endurance in the cold, so real results depend on settings and conditions. For a UAE owner this matters mostly on ski trips or mountain travel; in the desert heat, the bright 3,000-nit screen is the more useful feature.
Who This Is Not For
The 48mm Amazfit T-Rex 3 Pro does not suit slim wrists or anyone who wants a watch that slides under a shirt cuff: it is 48 x 48 x 14 mm, and the 44mm version exists for that reason. Neither size runs a large third-party app store like Wear OS or watchOS, and some features (Zepp Flow, membership cards) depend on country support. The charger is a magnetic head with no cable included, so you need your own USB cable. It is not a medical device.
Ordering from Totot
Totot sells the Amazfit T-Rex 3 Pro brand-new and genuine in its sealed box, backed by a 1-year warranty from Totot. We deliver UAE-wide in up to 3 business days, and delivery is free on orders from AED 300, with cash on delivery or instalments via Tabby and Tamara. Items that arrive defective or not as ordered can be returned within 14 days, and any shipping damage should be reported within 48 hours of delivery. Browse more in our Smart Watches range, or see the official Amazfit T-Rex 3 Pro page with full technical specifications.
Amazfit T-Rex 3 Pro Specifications
- Model: Amazfit T-Rex 3 Pro, 48mm
- Case dimensions: 48 x 48 x 14 mm (44mm version: 44.8 x 44.8 x 13.2 mm)
- Weight without strap: 52 g (44mm version: 46.8 g)
- Materials: Fibre-reinforced polymer case, Grade 5 titanium bezel and buttons
- Display: 1.5-inch AMOLED, 480 x 480, 322 ppi, up to 3,000 nits peak (44mm: 1.32-inch, 466 x 466)
- Glass: Sapphire
- Battery: 700 mAh rated (44mm: 500 mAh)
- Typical use: Up to 25 days (44mm: up to 17 days)
- Heavy use: Up to 10 days (44mm: up to 8 days)
- Accurate GPS Mode: Up to 38 hours (44mm: up to 26 hours)
- GPS Max Battery Life: Up to 116 hours, Hiking and Climbing modes only (44mm: up to 86 hours)
- Water resistance: 10 ATM; diving suitability to 45 m per Amazfit
- Positioning: Dual-band, 6 satellite systems, circularly polarised antenna
- Maps: Offline maps, turn-by-turn directions, route planning and import
- Flashlight: Two-colour LED, 200 lux (300 lux in Boost Mode)
- Sensors: BioTracker 6.0 PPG, accelerometer, gyroscope, geomagnetic, barometric altimeter, ambient light, temperature
- Connectivity: Bluetooth 5.2, BLE, Wi-Fi 2.4 GHz; Bluetooth calling with speaker and mic
- Sport modes: 187
- Strap: 22 mm silicone, wrists 145–210 mm (44mm: 20 mm, 140–205 mm)
- Compatibility: Android 7.0 or later, iOS 15.0 or later, Zepp App
- In the box: Watch with strap, magnetic charging head (no cable), instruction manual
- Warranty: 1-year warranty from Totot
Amazfit T-Rex 3 Pro FAQ
Which size is this Amazfit T-Rex 3 Pro?
48 mm. It measures 48 x 48 x 14 mm and weighs 52 g without the strap.
How much longer does the 48mm battery last than the 44mm?
25 days versus 17 days with typical use, per Amazfit, thanks to a 700 mAh battery against 500 mAh. In Accurate GPS Mode it is 38 hours versus 26.
Is the 48mm screen better than the 44mm?
No, only larger. Both are AMOLED under sapphire glass with up to 3,000 nits; the 44mm is slightly sharper at 353 ppi versus 322 ppi.
Can I dive with the Amazfit T-Rex 3 Pro?
Yes. It is rated 10 ATM and Amazfit states diving suitability to 45 m, with freediving and recreational diving modes.
Can I use 44mm straps on the 48mm?
No. The 48mm takes 22 mm straps and the 44mm takes 20 mm straps.
Does it work with an iPhone?
Yes. Amazfit supports iOS 15.0 or later and Android 7.0 or later through the Zepp App.
Is it genuine?
Yes. We sell the genuine Amazfit T-Rex 3 Pro, brand-new in its sealed box.
How long does delivery take?
No more than 3 business days to any emirate, free from AED 300; the live fee for your order appears at checkout.
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