Smart Ring, No App Subscription, Size First with Sizing Kit, 7-Day Battery Life Activity & Sleep Tracker/Stress/Heart Rate Monitor, Waterproof Compatible with IOS & Android(Black,10#)

About this item 【Smart Sleep Analysis】Real-time monitoring of sleep movement, and transmission and recording in the App, including sleep duration, deep sleep duration, light sleep duration, awakening duration, etc., bringing you better sleep suggestions! 【24/7 Heart Health Monitoring】As a professional heart health consultant, the smart bracelet is equipped with a high-precision and high-performance heart rate sensor, which can accurately acquire data and monitor your heart activity around the clock. 【Movement Data Monitoring and Recording】Real-time monitoring of your various movement data, the number of steps in a day, the distance of movement, calorie consumption, and the trend of movement changes in a day, view it on your phone anytime, anywhere! 【Excellent Waterproof Performance】Medical grade stainless steel shell material, lighter and harder, available in black and gold color. More IP68 waterproof, you can wash your hands, take a bath, swim. No worries! 【Professional Grade Ultra-Precision Sensors】Acceleration Sensor, Optical Heart Rate Sensor, Optical Blood Oxygen Sensor, and Infrared Sensor work at the same time, comparable to professional devices! 【Free App】Smart bracelet health tracker data can be viewed on the mobile app for free without any subscription fee. The device supports Android 5.1 and iOS 8.0 and above. 【100% After-sales】 If you encounter any problems during the use, please contact us through Amazon message in time. We will reply within 12 hours. We provide you with a full range of technical support!