Smart Monitoring Sleep Blood Oxygen Heart Rate Health Bluetooth Multi-function Ring

Product information:
Size: No. 8 (inner diameter mm), No. 9 (inner diameter 19mm), No. 10 (inner diameter mm), No. 12 (inner diameter mm),
Applicable people: men and women
Battery capacity: 17.5mAh
Additional features: Waterproof
Wearing method: finger wearing
Packing List: product charger manual
Charging Method: magnetic charging

Ring * 1+charger * 1+instruction manual * 1