POENVFPO Smart Fitness Ring - Size 12(ID 21.4mm / 0.84in C 67.2mm / 2.65in)

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 18.2mm / 0.72in No.9 19mm / 0.75in No.10 19.9mm / 0.78in No.11 20.7mm / 0.81in No.12 21.5mm / 0.85in How to Use: Download the APP, connect and bind. Packing List: 1 x Smart Ring​​ 1 x Instruction Manual 1 x Charging Cable 1 x Charging Case