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Ring size diameter (mm) No. 7 17.4mm No. 8 18.2mm No. 9 19mm No. 10 19.9mm No. 11 20.7mm No. 12 21.5mm Weight: about 2.5g Color: gold, sub-black, sub-silver, bright silver, yellow color Main functions: gesture brush Douyin, gesture swing to take pictures, number of steps, distance, calorie calculation, heart rate, blood oxygen saturation, pressure, sleep tracking, multi-exercise mode Chipset (German Dialog DA14531) - Ultra-low power consumption, longer lasting APP Jring Compatible System Android 5.0 or above, iOS 10.0 or above FLASH memory RAM 96KB ROM 128KB BT 5.1 Bluetooth Low Energy Chip Acceleration sensor (Sensor) SC7A20 Heart Rate (Heart Rate) Tianyi Core, Tianyi 3602 Battery Type Polymer pure cobalt battery Capacity (Capacity) 16mAh Charging Method Magnetic charging - data cable charging/charging compartment charging Supported languages: multiple languages Waterproof Level 5ATM Charging time: Approximately 2 hours Life time 7-9 days for use, 10-15 days for standby Appearance material Titanium alloy ten filling process