Description/Features:ensuring continuous health monitoring and activity tracking without frequent charges.Health Monitoring Features: Keep track of with advanced sensors that monitor heart rate, sleep quality, and more, helping you maintain a healthy lifestyle.Versatile Sports Tracking: Track multiple sports activities with precision, whether you are running, swimming, or cycling, making it an ideal companion for any athlete.Convenient Charging Case: Comes with a sleek charging case that not only protects the ring but also ensures it is to go.Specifications:APP:QringBluetooth: 5.0Battery capacity: 17mAhCharging : Magnetic chargingColor:GoldSIZE (International Code/US Code) SIZE 7, Diameter (mm) 17.4, circumference (mm) 55; SIZE 8, Diameter (mm) 18.2, circumference (mm) 57; SIZE 9, Diameter (mm) 19, circumference (mm) 59.8; SIZE 10, Diameter (mm) 19.9, circumference (mm) 62.4; SIZE 11, Diameter (mm) 20.7, circumference (mm) 65; SIZE 12, Diameter (mm) 21.5, circumference (mm) 67.5;Specifications:NO.10Material: StainlsteelDue to different batches, there may be differences in product printed text, which will not affect usePackage Contents:1 x Smart Ring (with Charging Case)Only the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.