Cuifati Smart Ring Health Tracker - #8 #9 #10

Spec: Item Type: Color Screen Smart Ring Material: stainless steel. Ring Battery Capacity: 18 mAh, Lithium Cell (Built in) Charging Case Battery Type: Lithium Cell (Built in) Charging Case Battery Capacity: 300 mAh. Size Inner Diameter 8 17.7 mm / 0.7 inches. 9 18.9 mm / 0.74 inches. 10 20.4 mm / 0.8 inches. 11 21mm / 0.83in 12 21.6 mm / 0.85 inches. How to use: Refer to user manual. Packagelist: 1 x Color Screen Ring 1 x Charging House. 1 x Power case charging case. 1 x user manual (English language not guaranteed). Note: Manual measurement, ±0.2mm error. br/> / >