GT4 Smart Watch Adult NFC Compass Smartwatch Heart Rate Monitor Bluetooth Calls Sport Watch GT4 46mm for Android IOS Parameters screen size: 1.43 inch Screen screen type: Real screen screen resolution: 466*466 Bluetooth: Low power Bluetooth 5.3 Built-in chip: BT8959B5 Strap material: Silicone + Leather Watch body material: Zinc alloy Waterproof level: life waterproof Charging type: Magnetic wireless charging Battery capacity: 330mAh Adultus style: 5 kinds of Adultus style Support: Android 6.0 and above iOS 12.0 and above APP: FitCloudPro ( Connect the watch to the mobile phone ) watch funcion Screen, Raise to wake up , Cover the screen to turn off, Bluetooth calls, Message pushed, heart rate monitoring, Activity record, Bluetooth music, Ai voice assistant, Compass, Sleep monitoring, Find phone, Breathe trainning, timer, Calendar, Caculator, Stopwatch, Alarm clock(setting by FitCloudPro), NFC door access, Weather, Blood oxygen monitoring, Do not disturb mode, power saving mode, screen light adjustable,... Note NFC door access ( It doesnt support NFC