XUMIUZIY Smart Ring 21.6mm Stainless steel

Specification: Item type: smart ring fitness tracker Material: stainless steel + glue filling. Ring Battery Type: Li Battery, Ring Battery Capacity: 20mAh (with built-in battery for shipping) Battery life of the ring: approx. 7 days Ring charging time: approx. 60 minutes APP: For Luckring How to use: See User Manual PackageList: 1 x Ring Smart 1 x RINE COVER 1 x instruction manual. 1 x charging cable. Note: Before buying, please pay attention to the size. We strongly recommend that you refer to the size chart and measure the circumference of your finger to ensure the most comfortable wearing effect, and avoid unnecessary returns or exchanges.