Flash memory size: 128MB Android system: Supports Android 4.4 and later IOS: Apple IOS10.0 or later Heart rate sensor: Zhanheng BD1820 Bluetooth: dual Bluetooth 5.0 Waterproof level: IP68 Product process: plastic spraying IML Screen size: 1.45-inch full circle Screen resolution: 454*454 Screen Type: IPS full-view colour screen Screen material: TFT Total length of wristband: 260mm Wristband material: TPU Battery Voltage: 4.2V Battery capacity: 550mAh Battery life: 4-5 days for normal connection and 10-15 days for standby. (Connection usage depends on personal usage) Charging Method: magnetic charging Charging time: about 4 hours
