【Perfect Fit Guide】 Before buying the Milavan Smart Ring, check the ring size chart and measure your finger circumference for a comfortable fit. Avoid returns with our ring sizing kit and ring sizer measuring tool. 【24/7 Health Monitoring】 This slim fitness tracker ring tracks heart rate, blood oxygen, and blood pressure every 30 mins. Works as a heart monitor, sleep tracker, and health tracker ring for comprehensive wellness management. 【Advanced Sleep Analysis】 The smart sleep tracker ring monitors deep/light sleep, REM cycles, and wakefulness. Optimize rest with sleep tracking ring insights via the app. 【8 Sport Modes & Activity Tracking】 Automatically records steps, calories, distance, and heart rate during workouts like running, yoga, golf, and hiking. A step tracker, pedometer, and fitness tracker ring in one! 【Slim Design & Smart Features】 Ultra-thin 2mm smart ring with a polished inner surface for all-day comfort. Long battery life (3-5 days), remote camera control, and health data sharing make it the best smart ring for couples & families. AI Smart Ring for Women Men - Sleep Tracker Ring with Heart Rate , Blood Oxygen , 10ATM Waterproof Fitness Ring , Step Counter & GPS Activity Fitness Tracker ,7-Day Battery for iOS/Android