Product parameters:Bluetooth: 4.0Operating system: mobile requires Android 5.0 or IOS 8.0 and aboveScreen resolution: 80*60Connection parameters: Bluetooth 4.0 / BT4.0 USBBattery capacity: 80mAhWaterproof rating: IP67Main functions: time display, step counting, calorie consumption, call reminder, information reminder, alarm reminder, sedentary reminder, drink reminder, raise hand screen, smart anti-lost, sync data to APK/APP, sleep monitoring, shake one Shake tos, heart rate test, blood oxygen test, blood pressure monitoring, etc.Packing box size: 11.1*8.7*2.8cm