HWSYTEK Smart Ring Fitness Tracker - 10#

Ring size internal diameter (mm): 6#16.5mm, 7#17.3mm, 8#18.1mm, 9#18.9mm, 10#19.8mm, 11#20.6mm, 12#21.4mm, 13#22.2mm Weight: 5.0g Color (Color) Rose Gold + White Major function: steps, calorie calculation ,Heart rate, blood oxygen saturation, sleep tracking, smart photography APP Compatible System: Android 5.1 / IOS8.0 RAM Memory (main control built-in) 4Mb Connection parameter:BT 5.0 Battery Type: Polymer Lithium Ion Capacity: 20mAh Charging Method: Magnetic charging Waterproof Level: IP68 Charging time: 1-2 hours Life time: 5 days, Standby: 10 days Appearance material: Epoxy resin + stainless steel (enamel)