Masyrt Smart Ring - 8 ID: 18.1mm/0.711in, Circumference: 56.9mm/2.24in

Specification: Item Type: Smart Ring Material: Stainless Steel Ring Battery: 18mAh, Li Ion Battery (Built in) APP: Support for EcTri How to Use: Download the APP first, then connect to it. The ring will automatically turn on when fully charged. packing list: 1 x Smart Ring 1 x Instruction Manual 1 x Instruction Card 1 x Ring Charging Cable Notice: