Xiaomi Watch S4

Display: 1.43″ AMOLED display | Dynamic | Custom screen-off dial Product Dimensions: 47mm × 47mm × 12mm Product Weight: 44g (without strap) Resolution: 466 × 466, 326PPI Brightness: 1500 nits Global Brightness | 2200 nits Peak Brightness Refresh Rate: 60Hz Battery: 486mAh | Lithium-ion polymer battery Fast Charging: 5-minute charge provides nearly 2 days of battery life Water Resistance Rating: 5ATM Charging Port: 2-Pin magnetic charging dock Operating System: Xiaomi Surge OS 2 Compatibility: Android 8.0 and iOS 12.0 Wireless Connectivity: Bluetooth® 5.2 Additional Features: Rotating Crown | 150 Sports Mode Sensors: Heart Rate Sensor (with Blood Oxygen Sensor) | Accelerometer | Gyroscope | Electronic Compass | Barometer Sensor | Ambient Light Sensor | Hall Sensor Satellite Positioning Systems: Dual-frequency GNSS | BeiDou | GPS | GLONASS | Galileo | QZSS