Yoidesu Smart Tracker Health Ring - IP68 Size 10

Specification: Item Type: Smart Ring with Screen Material: Stainless Steel Ring Battery Capacity: 18mAh, Lithium Cell (Built in) Charging Case Battery Type: Lithium Cell (Built in) Charging Case Battery Capacity: 300mAh Color: Black Size Inner Diameter No.8 16mm / 0.63in No.9 18mm / 0.71in No.10 20mm / 0.79in No.11 23mm / 0.91in No.12 25mm / 0.98in How to Use: Download the APP, connect and bind. PackageList: 1 x Smart Ring 1 x Instruction Manual 1 x Charging Cable 1 x Charging Case