- Model: V9 Pro Max 49mm - Certification: RoHS, CE, FCC and others - Watch system: Wearfit operating system - Link app: WearFit Pro - System requirements: Android 5.0+ / iOS 10.0+ - Main chip: SF32LB551 - Screen: 2.1 inch AMOLED, 420*420 pixels - Memory: 128 MB - Bluetooth calls: Yes - Bluetooth: 5.2 - Heart rate chip: SC7R30 - Button method: Touch screen + dual keys + buttons - Charging port: Wireless charging - Battery capacity: 380 mAh - Usage time: About 10 days - Standby time: 65 days - Water resistance: IP68  (splash resistant, swimming with the watch is not recommended) - Charging: Wireless - Functions: NFC, compass, 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 password, heart rate monitoring, blood pressure, blood oxygen monitoring, fatigue analysis, calculator, changing the clock wallpaper as desired... The watch comes with two wristbands.   Connect it to the Wearfit Pro app so you can use all its functions.