Before Buying: Before purchasing the Smart Ring, we highly recommend referring to the size chart and measuring your finger circumference to ensure the most comfortable fit and avoid unnecessary returns or exchanges Health Monitoring: The slim ring features advanced 4.0 sensors that automatically measure your heart rate, blood oxygen, HRV every 30 min when worn. It provides continuous health tracking and comprehensive wellness management all day Intelligent Sleep Tracker: The fitness ring automatically monitors your sleep quality. It can record deep & light sleep duration, eye movement, and wakefulness. You can view various indicators anytime in the app and adjust your lifestyle based on reports Multiple Sports Modes Tracking: Such as Running, Cycling, Walking, Hiking, The smart ring automatically tracks the workout route, sport time, steps, heart rate, speed, calories burned, and distance, you can view the details in the app Take a photo with a gesture: Wave your hand to take a picture immediately, Innovative design, so that you can easily capture the beautiful moment anytime and anywhere Show current time on the ring screen: Touch to display the current synchronization time, konw the current time with just a glance at the ring NO Subscription Fees: Your purchase includes lifetime access to both the ring health tracker and its companion App — no subscription fees, download the app free. Enjoy real-time health tracking by the smart ring without any extra fees The smart ring features a display to show the time and advanced IC sensors that automatically measure your heart rate, blood oxygen, HRV every 30 min when worn.