Amazfit · 2021
T-Rex ProSize, Dimensions & Wrist Fit
The Amazfit T-Rex Pro sits best on flat wrist widths of about 50–68mm (≈ 13.4–18.2cm wrist circumference). Adjust the slider below to check your wrist.
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The T-Rex Pro in short
The figures that decide whether this watch suits you, pulled out of the full specification sheet further down.
- 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. Thinner than 69% of 48mm watches, so it slides under a cuff more easily than most of its size.
- 1.3 inches OLED/AMOLED display, always-on capable.
- Takes 22mm bands, so third-party straps fit without an adapter.
Does the T-Rex Pro fit your wrist?
Drag the slider to your wrist width and see the T-Rex Pro overlaid at true scale. Lug-to-lug — not case diameter — decides whether a watch overhangs your wrist.
Happy with the fit? Check current availability for the T-Rex Pro.
Check price on AmazonHow long the T-Rex Pro lasts, by power mode
Runtime changes by a factor of 11 depending on what you leave switched on. Bars are scaled against the longest mode.
- Smartwatch18 days
- GPS40 hours
What size band does the T-Rex Pro take?
Lug width
22mm
Any 22mm strap fits, so you are not restricted to Amazfit's own bands. Quick-release pins let you swap without tools — check that a replacement lists 22mm and quick-release before buying.
Affiliate disclosure: As an Amazon Associate, WatchFitTool earns from qualifying purchases. If you buy through links on this page, we may earn a commission at no extra cost to you. Learn more.
T-Rex Pro specifications
The figures that decide a purchase, followed by every line Amazfit publishes.
- 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
Full specification sheet
115 published lines across 8 groups, unedited
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
- pixel density
- 391.6 ppi
- width of band
- 22 mm
- water resistance
- Waterproof
- Always-On Display
- has a touch screen
- Gorilla Glass version
- Gorilla Glass 3
- waterproof depth rating
- 100 m
- Watch band is replaceable
- Has sapphire glass display
- maximum operating temperature
- 70 °C
- has branded damage-resistant glass
- lowest potential operating temperature
- -40 °C
Battery
- charge time
- 1.5 hours
- battery life
- 18 days
- battery power
- 390 mAh
- has wireless charging
- has a removable battery
- battery life with GPS on
- 40 hours
- Has a solar power battery
- has a rechargeable battery
Sensors
- has GPS
- has a compass
- Has a barometer
- has a gyroscope
- Has a cadence sensor
- has an accelerometer
- Monitors perspiration
- Has a heart rate monitor
- Has a temperature sensor
- Monitors blood oxygenation levels
Features
- release date
- 2021-03-27
- Has a stopwatch
- Has smart alarm
- warranty period
- 1 years
- Has call control
- Has silent alarm
- has HRV tracking
- measures VO2 max
- Has notifications
- Has ECG technology
- Locates your phone
- has a front camera
- has fall detection
- has voice commands
- Acquires GPS faster
- Has vibrating alerts
- shows readiness level
- Can be used to answer calls
- measures resting heart rate
- has irregular heart rate warnings
- has fast/slow heart rate notifications
- Has a built-in camera remote control function
Connectivity
- has NFC
- supports ANT+
- supports Wi-Fi
- supports Galileo
- Bluetooth version
- 5
- has a cellular module
- Is compatible with iOS
- Is compatible with Android
Miscellaneous
- has aptX
- Has passcode
- Has auto pause
- Is compatible with Windows
- Is compatible with Mac OS X
- has an external memory slot
- Compatible with smart scales
- has a battery level indicator
- has a socket for a 3.5 mm audio jack
- Compatible with external heart rate monitors
App & Software
- Ad-free
- Free app
- Tracks BMI
- Has coaching
- Includes maps
- Supports routes
- Has achievements
- Has goal setting
- Has live tracking
- Has exercise diary
- Predicts ovulation
- Can be personalised
- Has weight tracking
- Predicts start date
- Tracks water intake
- Has inactivity alerts
- Has period notifications
- Has temperature tracking
- Provides activity reports
- Displays fertile window notifications
- Counts how many calories you've burned
Activity tracking
- Measures pace
- Tracks distance
- Tracks elevation
- Designed for golf
- Tracks your sleep
- Tracks steps taken
- Designed for diving
- Has a route tracker
- Has exercise tagging
- Has multi-sport mode
- Tracks calorie intake
- Provides sleep reports
- Detects activities automatically
- Has a stroke counter for swimming
Compare the T-Rex Pro head to head
How each one differs in the three measurements you can feel on the wrist. Figures are relative to the T-Rex Pro.
Alternatives to the T-Rex Pro
Watches that cover a similar amount of wrist, with the measurements that separate them.
Amazfit
Balance 2
- Width
- 47.4mm
- Thick
- 12.3mm
- Weight
- 43g
Amazfit
Pop 2
- Width
- 47.2mm
- Thick
- 12.9mm
- Weight
- 64g
Amazfit
Falcon
- Width
- 47.2mm
- Thick
- 13mm
- Weight
- 64g
Amazfit
GTR
- Width
- 47.2mm
- Thick
- 10.75mm
- Weight
- 48g
Amazfit
Stratos 3
- Width
- 48.6mm
- Thick
- 13.4mm
- Weight
- 40.4g
Amazfit
Active Edge
- Width
- 46.6mm
- Thick
- 12mm
- Weight
- 34g
T-Rex Pro — Frequently Asked Questions
Will the Amazfit T-Rex Pro fit my wrist?
The Amazfit T-Rex Pro looks balanced on flat wrist widths of roughly 50–68mm (about 13.4–18.2cm circumference). Drag the slider above to check it against your own measurement.
What size band does the Amazfit T-Rex Pro take?
22mm. Any 22mm strap fits, so you are not limited to Amazfit's own bands — look for a quick-release fitting if you want to swap without tools.
How long does the Amazfit T-Rex Pro battery last?
Between 40 hours and 18 days per charge, depending on the power mode. Amazfit rates Smartwatch at 18 days and GPS at 40 hours; the chart above lists all 2 modes.
Is the Amazfit T-Rex Pro thick for a 48mm watch?
At 13.5mm, thinner than 69% of 48mm watches, so it slides under a cuff more easily than most of its size. Thickness, not case width, is what decides whether a watch catches on a shirt cuff.
What other watches are the same size as the Amazfit T-Rex Pro?
Oppo Watch X2, Huawei Watch 4 Pro, Mobvoi TicWatch Pro 5, ZTE Watch GT all sit within half a millimetre of the Amazfit T-Rex Pro's 47.7mm case, so they cover the same amount of wrist.
