cnBro Smart Ring - Ultra Thin Heart Rate Monitor

MULTIFUNCTIONS: - Gestures : Brush short videos - Motion Sensing Games - Pedometer:Steps,Calories,Distance - Heart Rate Monitor - Exercise Monitor - Remote Camera - Sleep Tracker HARDWARE: Bluetooth:5.3 Charging Type:Magnetic Charging Full Charge Time:About 0.5-1 Hour Ring Battery:18mAh APP:ECTRI Standby Time:One full charge gives you(3-5 days of working time) iOS 11.0 or above,Android 6.0 or above Ring Material:Stainless Steel Packaging Accessories: Smart Ring*1 Charger*1 Manual RING SIZE: US8 (Ring inner diameter:18.1mm/0.71",Ring circumference:56.8mm/2.24") US9 (Ring inner diameter:18.9mm/0.74",Ring circumference:59.3mm/2.34") US10 (Ring inner diameter:19.8mm/0.78",Ring circumference:62.2mm/2.44") US11 (Ring inner diameter:20.6mm/0.81",Ring circumference:64.7mm/2.54") Weight:2.5g - IP68 Waterproof - DO NOT suitable for hot water bathing,diving,water-related work. Any questions,please kindly contact us,we would always offer best solution to you.