TOPINCN Smart Ring - Silver Heart Rate Blood Oxygen

Spec: Item Type: Smart Ring Material: Metal Ring Battery Type: Lithium Battery x1 (Built in Battery) Ring Battery Capacity: 18mAh Ring Battery Life: Approx. 3-5 days Ring Charging Time: 60 minutes Charging Box/Cover​ Battery Type: Lithium Battery x1 (Built in Battery) Charging Box/Cover​ Battery Capacity: 300mAh How to Use: 1. After downloading the app, activate it following the instruction manual. 2. Then use ​ to connect and start using. Package List: 1 x Smart Ring 1 x Instruction Manual 1 x USB Cable 1 x Battery Box/Cover​