Xiaomi Watch S4

Key Features:

• 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 
• 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
• 150+ sports modes