Dimensions : 48.1mm x 39.2mm x 10.6mm Weight : 29.2g (without inbox strap) Frame : Plastic (NCVM) Strap : TPU strap Sensors : Heart rate sensor (with blood oxygen sensor), Accelerometer, Gyroscope Satellite positioning Systems : GPS, Galileo, Glonass, BeiDou, QZSS Battery : Typical use time 18 days Battery Capacity : 470mAh Display : 1.96" Square AMOLED display Resolution: 410 x 502, 332PPI Others :  Built-in GNSS, Speaker, Bluetooth call Wireless connectivity : Bluetooth 5.3  Operating System : Xiaomi HyperOS Compatibility : only supports smartphones with Android 8.0 and above, iOS 12.0 and above