COLMI R02 Smart Ring, a Smart Ring for Women and Men, with a Charging case, Supports Heart Rate, Blood Oxygen, Sleep Health Monitoring, and Sports Tracking Ring, No Subscription Fee. (Black, 7#)

[Purchase a Sizing Kit] Before purchasing the COLMI R02 smart ring, we strongly recommend that you purchase the COLMI sizing kit or measure your finger size according to the size chart to help you choose the correct ring size for a comfortable fit and to avoid unnecessary returns or exchanges.

[No App Subscription Fee Required] Say goodbye to monthly bills! The COLMI smart ring requires no app subscription fee. Enjoy all features right out of the box, instantly unlocking core data such as heart rate monitoring, sleep analysis, and 24/7 activity tracking, making health management pure and simple.

[Portable Charging Case] Includes a compact charging case for charging anytime, anywhere, without worrying about running out of power.

[Activity Tracking] Easily track steps, distance, and calories burned to motivate you to stay active every day.

[Heart Rate Measurement] 24/7 smart heart rate measurement allows you to understand your heart rate status and monitor heart rate abnormalities, keeping track of your daily health.

[Sleep Measurement] Detects falling asleep and waking up, monitors sleep quality and duration, and generates concise reports to help you understand your sleep patterns and adjust your habits for a more restful rest.

[Photo Control] Remote camera control allows you to control your phone's camera with a flick of a finger, making selfies, group photos, and creative photography more convenient.

[Best After-Sales Service] Thank you for your trust and we provide professional after-sales service. If you have any usage or quality issues, please feel free to contact us. Included accessories: 1 smart ring, 1 portable charging case, 1 charging cable, and 1 instruction manual.