Screen: AMOLED color screen | Resolution: 194 x 368 pixels | Size: 1.47 inches Connectivity: Bluetooth: 2.4 GHz, BT5.0, BLE Sensor: 6-axis IMU sensor (Accelerometer sensor, Gyroscope sensor) | Optical heart rate sensor Water Resistant: 5 ATM water-resistant Material: Wrist strap: Silicone rubber System requirements: Android 6.0 or later | iOS 9.0 or later