Specifications: Technical Parameters System requirements Android 4.4 and above, IOS 8.0 or more, support Bluetooth 4 Bluetooth BLE V4.0 Master chip RTL8762AG Sensor Reflective photoelectric heart rate sensor Display 0.68 inch OLED Battery 70 m Ah Standby time 30 day Working hours 7 day Operation mode Capacitive touch button Alert mode High sensitive built-in motor Charging interface Two magnetic data line Waterproof grade Life waterproof APP/APK download mode Android: Hfitcloud Apple: Hfitcloud Reminder: IOS system in Apple should use the store, Android mobile phones in 360 mobile assistant and other major applications store search APK Hfitcloud download and install. Package Included: 1x Water-proof Smart-watch 1x USB (Universal Serial Bus) Cable 1x User manual