- Model: STY-Watch 9 - Watch System: Wearfit Operating System - Connection App: WearFit Pro - System Requirements: Android 5.0+ / iOS 10.0+ - Main Chip: 8959 - Screen: 2.01 inch, 240*296 pixels - Memory: 128MB - Bluetooth Calls: Yes - Bluetooth: 5.2 - Heart rate chip: SC7R30 - Button method: Touch screen + dual keys + buttons - Charging port: Wireless charging - Battery capacity: 220mAh - Waterproof: IP68  (splash resistant, not recommended to swim with the watch) - Functions: NFC, voice commands, calls, weather forecast, step measurement, calorie measurement, distance measurement, sports mode, sleep monitoring, message and call notifications, alarm setting, stopwatch, location sharing, screen lock with a password, heart rate monitoring, blood pressure, blood oxygen monitoring, fatigue analysis, calculator, changing the watch wallpaper as desired... Connect it with the Wearfit Pro app to use all its functions.