ciciglown84uhk07g5-13 - Inner Diameter 19.9mm

Spec: Item Type: Smart Ring Material: Aluminum Alloy, Electronic Components Ring Battery Type: 18mAh Lithium Battery (Shipped with Built in Battery) Ring Battery Life: About 3‑5 Days Ring Charging Time: 45 Minutes How to Use: After receiving the ring first download the APP, the ring is full of self starting, and then connect the Bluetooth can be used. Package List: 1 x Smart Ring 1 x Charging Cable 1 x Instruction Manual Note: All data are measured manually, and there are certain errors in the measurement results.