cnBro Smart Ring - Heart Rate Monitor NFC Ceramic

MULTIFUNCTIONS: - Family Care - NFC Control - Pedometer:Steps,Calories,Distance - Heart Rate Monitor - Exercise Monitor - Remote Camera - Sleep Tracker HARDWARE: Bluetooth:5.0 Full Charge Time:About 1 Hour Charging Requirement:Charging 1A or less Ring Battery:15-20mAh APP:SmartHealth Standby Time:One full charge gives you(3 days of working time) iOS 11.0 or above,Android 6.0 or above Ring Material:Stainless Steel Packaging Accessories: Smart Ring*1 Manual Charing Case*1 RING SIZE: BLACK&WHITE COLOR: #7 (Ring inner diameter:17.3m/0.67",Ring circumference:54.6mm/2.13") #8 (Ring inner diameter:18.1mm/0.71",Ring circumference:57.1mm/2.23") #9 (Ring inner diameter:18.9m/0.74",Ring circumference:59.6mm/2.32") #10 (Ring inner diameter:19.8m/0.76",Ring circumference:62.5mm/2.47") #11 (Ring inner diameter:20.6m/0.81",Ring circumference:65mm/2.53") #12 (Ring inner diameter:21.4m/0.84",Ring circumference:67.5mm/2.64") #13 (Ring inner diameter:22.2m/0.87",Ring circumference:70mm/2.73") PINK COLOR: #7 (Ring inner diameter:17.3m/0.67",Ring circumference:54.6mm/2.13") #8 (Ring inner diameter:18.1mm/0.71",Ring circumference:57.1mm/2.23") #9 (Ring inner diameter:18.9m/0.74",Ring circumference:59.6mm/2.32") #10 (Ring inner diameter:19.8m/0.76",Ring circumference:62.5mm/2.47") - IP68 Waterproof - DO NOT suitable for hot water bathing,diving,swimming,water-related work. Any questions,please kindly contact us,we would always offer best solution to you.