Parameter Display: 1.71-inch HD Touch TP: full screen touch Working time: 3 days Standby time: about 7 days Bluetooth: BLE5.2 System support: Android 5.0 or above, IOS 9.0 or above. Functions One key connection, multiple exercise modes, sleep detection, pedometer, heart rate, blood pressure, blood oxygen, message notification, dialing bluetooth call, bluetooth music, weather, calculator, alarm clock, sedentary reminder, stopwatch, photo taking, voice assistant, find cell phone, racing game, flashlight, calendar, contacts, drinking interval reminder, restart, shutdown, language setting, style setting, APP QR code, resting screen pointer, cover Hands resting screen, Spirit Island, Bedside lamp mode, Shake to answer, Do not disturb mode, Time and date setting, 12/24 hour system switching, Sound and touch settings, Restore factory settings.