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 APP: Dafit Specifications: Features 1.85-inch IPS square screen with full viewing angle Easy to replace strap, standard 22mm Massive dial push, custom dial Bluetooth calling/Bluetooth music, Weather display Heart rate detection, blood pressure detection, blood oxygen detection, all-day heart rate detection Time display, step counting, calories, distance, heart rate, blood pressure, blood oxygen, sleep time, switch display, stopwatch, multi-sport mode Sleep monitoring (sleep time, sleep quality) Call notification, information reminder, multi-language push, alarm clock reminder, remote photo, sedentary reminder The bracelet supports multiple languages 350mAh large battery, long standby time Sync data to APK/APP APP/APK download method: Android and Apple applications synchronize Da Fit Reminder (iOS system is in the Apple store, Android phone is in the application treasure to search for Da Fit APK to download and install) Scan the QR code to download and install Dafit Package Included: 1*Smart Watch 1*Charging cable 1*Instruction