Display : 1.83"HD rectangle screen Chip:8763EWE Resolution : 240*286 Battery Capacty : 380mAh polymer battery APP : Dafit Compatible OS : Android & IOS Compatability : Android 6.0 / ios 9.0 and above more→system Connection method : Smartphone connected with App via Bluetooth 5.0 Waterproof Rating: IP67 Heart Rate: Yes Pedometer: Yes Calorie Counter: Yes Screen diagonal: 1.83inch Function: Package contents are as follows Package 1 Watch 1* Strap 1* Package 2 Watch 1* Strap 2* Dial, Favorite Contacts, Call History, Step Counter, Sleep, Heart Rate, Exercise, Blood Pressure, Weather, Camera Control, Blood Oxygen, Music Control, Stopwatch, Alarm, Timer, Sedentary Reminder, Breathing Training,