Amazfit · 2021
T-Rex Pro Size, Dimensions & Wrist Fit
The T-Rex Pro looks in proportion on wrists of 17 cm (6.7 in) and up round, and fills the wrist at 18–20 cm (lug-to-lug estimated at ≈55mm; Amazfit does not publish it).
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Does the T-Rex Pro fit your wrist?
| Wrist round (mm left each side) | 47.7mm≈55mm lug to lug, est. |
|---|---|
| 14 cm / 5.5 in | Overhangs (4.9mm over) |
| 15 cm / 5.9 in | Overhangs (3.3mm over) |
| 16 cm / 6.3 in | Overhangs (1.7mm over) |
| 17 cm / 6.7 in | Overhangs (0.1mm over) |
| 18 cm / 7.1 in | Sweet spot (1.5mm) |
| 19 cm / 7.5 in | Sweet spot (3.1mm) |
| 20 cm / 7.9 in | Sweet spot (4.8mm) |
The T-Rex Pro in short
- At 13.5mm, the thickest of the 6 Amazfit watches 47–49mm across.
- Between 40 hours and 18 days per charge depending on the power mode — smartwatch at best, gps at worst.
- Water rated to 100 m.
- 13.5mm thick. Middle of the pack for thickness at this width.
- 1.3 inches AMOLED display, always-on capable.
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Size, fit and battery side by side, against any smartwatch we list.
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T-Rex Pro battery life
Runtime by power mode
- Smartwatch18 days
- GPS40 hours
Charges in 1.5 hours
Where it ranks among Amazfit watches
- Everyday use18 days#9 of 54
- GPS tracking40 hours#8 of 29
- Capacity390 mAh#18 of 52
2D Dimension Schematics
- Amazfit T-Rex Pro 47.7mm × ≈55mm (est.) · 13.5mm thick
3D preview
Amazfit T-Rex Pro on a wrist
What size band does the T-Rex Pro take?
Lug width
22mm
Alternatives to the T-Rex Pro
T-Rex Pro specifications
- Battery life
- 18 days
- Display
- 1.3 inches
- Resolution
- 360 x 360 px
- Water rating
- 10 ATM
- Glass
- Gorilla Glass 3
- Strap
- 22 mm
- Charging
- 1.5 hours
Show all specificationsAmazfit's published specification, for reference · checked September 2026
Design
- width
- 47.7
- height
- 47.7
- volume
- 30.72 cm³
- weight
- 59.4 g
- thickness
- 13.5
- ATM rating
- 10 ATM
- resolution
- 360 x 360 px
- screen size
- 1.3 inches
- Display type
- OLED/AMOLED
- Has a display
- Yes
- pixel density
- 391.6 ppi
- width of band
- 22 mm
- water resistance
- Waterproof
- Always-On Display
- Yes
- has a touch screen
- Yes
- Gorilla Glass version
- Gorilla Glass 3
- waterproof depth rating
- 100 m
- Watch band is replaceable
- Yes
- Has sapphire glass display
- No
- maximum operating temperature
- 70 °C
- has branded damage-resistant glass
- No
- lowest potential operating temperature
- -40 °C
Battery
- charge time
- 1.5 hours
- battery life
- 18 days
- battery power
- 390 mAh
- has wireless charging
- Yes
- has a removable battery
- No
- battery life with GPS on
- 40 hours
- Has a solar power battery
- No
- has a rechargeable battery
- Yes
Sensors
- has GPS
- Yes
- has a compass
- Yes
- Has a barometer
- Yes
- has a gyroscope
- Yes
- Has a cadence sensor
- No
- has an accelerometer
- Yes
- Monitors perspiration
- No
- Has a heart rate monitor
- Yes
- Has a temperature sensor
- No
- Monitors blood oxygenation levels
- Yes
Features
- release date
- 2021-03-27
- Has a stopwatch
- Yes
- Has smart alarm
- No
- warranty period
- 1 years
- Has call control
- Yes
- Has silent alarm
- Yes
- has HRV tracking
- Yes
- measures VO2 max
- Yes
- Has notifications
- Yes
- Has ECG technology
- No
- Locates your phone
- Yes
- has a front camera
- No
- has fall detection
- No
- has voice commands
- No
- Acquires GPS faster
- Yes
- Has vibrating alerts
- Yes
- shows readiness level
- Yes
- Can be used to answer calls
- No
- measures resting heart rate
- Yes
- has irregular heart rate warnings
- Yes
- has fast/slow heart rate notifications
- Yes
- Has a built-in camera remote control function
- No
Connectivity
- has NFC
- No
- supports ANT+
- No
- supports Wi-Fi
- No
- supports Galileo
- Yes
- Bluetooth version
- 5
- has a cellular module
- No
- Is compatible with iOS
- Yes
- Is compatible with Android
- Yes
Miscellaneous
- has aptX
- No
- Has passcode
- Yes
- Has auto pause
- Yes
- Is compatible with Windows
- No
- Is compatible with Mac OS X
- No
- has an external memory slot
- No
- Compatible with smart scales
- Yes
- has a battery level indicator
- Yes
- has a socket for a 3.5 mm audio jack
- No
- Compatible with external heart rate monitors
- Yes
App & Software
- Ad-free
- Yes
- Free app
- Yes
- Tracks BMI
- Yes
- Has coaching
- Yes
- Includes maps
- Yes
- Supports routes
- Yes
- Has achievements
- Yes
- Has goal setting
- Yes
- Has live tracking
- Yes
- Has exercise diary
- Yes
- Predicts ovulation
- Yes
- Can be personalised
- Yes
- Has weight tracking
- Yes
- Predicts start date
- Yes
- Tracks water intake
- Yes
- Has inactivity alerts
- Yes
- Has period notifications
- Yes
- Has temperature tracking
- No
- Provides activity reports
- Yes
- Displays fertile window notifications
- Yes
- Counts how many calories you've burned
- Yes
Activity tracking
- Measures pace
- Yes
- Tracks distance
- Yes
- Tracks elevation
- Yes
- Designed for golf
- No
- Tracks your sleep
- Yes
- Tracks steps taken
- Yes
- Designed for diving
- No
- Has a route tracker
- No
- Has exercise tagging
- Yes
- Has multi-sport mode
- Yes
- Tracks calorie intake
- Yes
- Provides sleep reports
- Yes
- Detects activities automatically
- Yes
- Has a stroke counter for swimming
- Yes
