Specifications Dimensions 47.7 X 47.7 X 13.5mm Weight 59.4g (with Strap) Body Material Polycarbonate Strap Material Siliconeubber Strap Length 122mm (long) 78mm (short) Strap Width 22mm Water-resistance Grade 10 Atm Touchscreen Tempered Glass + Anti-fingerprint Coating Display 1.3 Hd Amoled Display Resolution 360 X 360 Always-on Display Sensors Biotracker™ 2 Ppg Bio-tracking Optical Sensor 3-axis Acceleration Sensor 3-axis Gyroscope Sensor Geomagnetic Sensor Ambient Light Sensor Barometric Altimeter Positioning Gps+glonass Gps+beidou Gps+galileo Bluetooth Bluetooth 5.0 Ble Battery 390 Mah Lithium-ion Polymer Battery (typical Value) Charging Time Up To 1.5 Hours Charging Method Magnetic 2-pins Pogo Pin Battery Life Typical Usage Up To 18 Days Heavy Usage Up To 9 Days Gps Continuous Working Time Up To 40 Hours Operating System Rtos Supported Devices Android 5.0 Or Ios 10.0 And Above Packing List Watch Body (including Standard Strap) Magnetic Charging Stand User Manual App Zepp App