1.85-inch IPS square screen full viewing angle, easy to replace the strap, standard 22mm.Mass dial push, custom dial.Bluetooth call/Bluetooth music, weather display.Heart rate detection, blood pressure detection, blood oxygen detection, heart rate detection all dayFunctions: time display, step counting, calories, distance, heart rate, blood pressure, blood oxygen, sleep time, power on and off display, stopwatch, multi-sport mode, sleep monitoring (sleep time, sleep quality), call notification, message reminder, multi-language Push push, alarm clock reminder, remote photo taking, sedentary reminder, bracelet supports multiple languages.350mAh large battery, super long standby time.Synchronize data to APK/APP.APP/APK download method, Android and Apple apps synchronize Da Fit.Reminder (IOS system is in the Apple Store, and Android phones are in the App Store to search for Da Fit APK to download and install).Scan the QR code to download and install Dafit.System requirements: Android 4.4 and above, IOS 8.0 and above, support Bluetooth 5.0.Bluetooth version: BLE 5.0.Main control chip: Realtek 8762DT.Memory: Flash 64MB.Screen resolution: 240*280.Heart rate: 3605.Horn: 0916.Battery capacity: 350mAh.Standby time: about 15 days.Working time: about 5-7 days.Motor: Built-in, vibration reminder.