Amazfit T-Rex SpecificationsDimensions47.7 X 47.7 X 13.5 mmWeight58g (with strap)Waterproofing5ATM, supports swimmingScreen1.3”AMOLED, Resolution 360 x 360Touch ScreenCorning Gorilla Glass 3 + anti-fingerprint coatingSensorsBioTrackerTM PPG Bio-Tracking Optical Sensor3-axis acceleration sensorGeomagnetic sensorAmbient light sensorPositioningGPS + GLONASSConnectivityBluetooth 5.0/BLEBattery390mAh LiPo (Minimum value)AccessoriesMagnetic charging base, user manualCharging methodMagnetic, 2pin pogo pin chargingTheoretical Charging TimeMagnetic, 2pin pogo pin chargingBattery LifeDaily use mode:20 days Heart rate monitoring always on, sleep monitoring; GPS turned on for 13 minutes a day, 150 messages pushed daily which activate screen, wrist raised 30 times which activate screen, 5 minutes of other operations.Basic watch mode: 66 days Bluetooth connection to phone turned off, heart rate monitoring and other functions, screen activated by wrist tilt 100 times a day.GPS continuous working time: 20 hours GPS activated to track exercise and monitor heart rate.Body MaterialPolymer materialsSupported devicesAndroid 5.0 or iOS 10.0 and above