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Amazfit T-Rex 3 Pro vs Garmin Fēnix 8 Pro (47mm)

Physical
Case diameter 47 mm
Case thickness 16 mm
Weight 77 g
Case material Titanium
Bezel material Titanium
Lens / crystal Sapphire crystal
Strap material silicone
Strap width
Colors available
Water resistance 100 m
Military standard
Display
Display type AMOLED
Display diagonal 1.4 mm
Resolution width 454 px
Resolution height 454 px
Touchscreen Yes No
Always-on display No No
Max brightness 3000 nits
Battery
Smartwatch mode 360 h
GPS-only mode
All-systems GPS mode
Max battery saver mode
Charging type Garmin proprietary plug charger
Solar charging No No
Wireless charging No No
Positioning
GNSS systems
Multi-band / dual-frequency Yes Yes
Offline maps Yes No
Built-in maps No Yes
Turn-by-turn navigation Yes No
Sensors
Optical heart rate Yes Yes
ECG No Yes
SpO2 / pulse oximeter No Yes
Skin temperature Yes No
Accelerometer No No
Gyroscope No No
Compass Yes Yes
Barometric altimeter Yes Yes
Ambient thermometer No No
Microphone No No
Speaker Yes No
Connectivity
Bluetooth Yes No
Wi-Fi Yes Yes
NFC payments No No
Cellular / LTE Yes Yes
ANT+ No No
Music storage Yes No
Third-party apps No No
Satellite communication No Yes
Health & Fitness
Sleep tracking Yes Yes
Stress tracking Yes No
HRV tracking Yes Yes
Training load No Yes
Training readiness / recovery Yes No
VO2 max estimate No Yes
Running dynamics No No
Body battery / energy score No No
Menstrual cycle tracking No Yes
Fall / incident detection No No
Guided workouts No No
Multisport / triathlon mode Yes Yes
Software
Operating system Zepp OS 5
Companion app
Voice assistant
Contactless payments No No