【Size Before You Buy】Please read the wearing instructions on the detail page, measure the circumference of your finger, find the appropriate ring size number and select it.,【New Smart Ring】Our smart ring tracks your sleep, activity, heart rate, blood oxygen, designed to help you understand your health data, and the free subscription can give you peace of mind. IP68 waterproof can easily cope with various environments. Note: The smart ring is charged using the charging case, when the charging case is low you can use a universal Type-C cable to charge the charging case (cable not included).,【Sleep Tracking】Helps you understand the different sleep stages of deep sleep, light sleep and wakefulness, and evaluates your total sleep time, to have a comprehensive understanding of the quality of your sleep and provide accurate data for improving sleep.,【Heart Rate Monitoring】With heart rate detection function, all-day dynamic heart rate trend and historical data recording, always know the heart health.,【Fitness Tracking】help you track steps, calories, and professional workout modes to track various activities such as walking, running, cycling, hiking, and swimming. You can adjust the fitness intensity based on the fitness data.,【Wide Compatibility】The smart ring is compatible with Android 5.0 and iOS 10.0 and above, waterproof up to 330 feet, can be used in complex environments, a perfect gift for family and friends.