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Amazfit T-Rex 3 Pro vs Garmin Cirqa Smart Band

Physical
Case diameter — 27 mm
Case thickness — 9 mm
Weight — 14.8 g
Case material — Polymer
Bezel material — —
Lens / crystal — —
Strap material — fabric (ComfortFit bands)
Strap width — —
Colors available — —
Water resistance — 50 m
Military standard — —
Display
Display type — —
Display diagonal — —
Resolution width — —
Resolution height — —
Touchscreen Yes No
Always-on display No No
Max brightness 3000 nits —
Battery
Smartwatch mode — —
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 — GPS
Multi-band / dual-frequency Yes No
Offline maps Yes No
Built-in maps No No
Turn-by-turn navigation Yes No
Sensors
Optical heart rate Yes Yes
ECG No No
SpO2 / pulse oximeter No Yes
Skin temperature Yes Yes
Accelerometer No No
Gyroscope No No
Compass Yes No
Barometric altimeter Yes No
Ambient thermometer No No
Microphone No No
Speaker Yes No
Connectivity
Bluetooth Yes No
Wi-Fi Yes No
NFC payments No No
Cellular / LTE Yes No
ANT+ No Yes
Music storage Yes No
Third-party apps No No
Satellite communication No No
Health & Fitness
Sleep tracking Yes Yes
Stress tracking Yes Yes
HRV tracking Yes Yes
Training load No Yes
Training readiness / recovery Yes Yes
VO2 max estimate No Yes
Running dynamics No No
Body battery / energy score No Yes
Menstrual cycle tracking No Yes
Fall / incident detection No No
Guided workouts No No
Multisport / triathlon mode Yes No
Software
Operating system Zepp OS 5 —
Companion app — —
Voice assistant — —
Contactless payments No No