Amazfit GTR2e Slate Grey Smart Watch (AMAZFIT-GTR2E-GREY) - Resolution: 454 x 454, Display: 1.39-inches, Capacity: Acceleration Sensor, Gyroscope Sensor, 3-Axis Geomagnetic Sensor, Ambient Light Sensor, Air Pressure Sensor, Temperature Sensor, Bluetooth Frequency: Bluetooth 5.0 / Ble, Touch Screen: Tempered Glass, Anti-Fingerprint Vacuum Coating, Waterproof Grade: 5 Atm (50 Meters), Microphone: Yes, GPS Supported, Operating system: Android 5.0 Or Ios 10.0 And Above, Colour: Slate Grey