Size and fit before purchase - Measure your finger circumference, then calculate the inner diameter to determine the correct ring size. Sleep monitoring and sleep score - Tracks sleep stages including deep sleep, REM sleep, light sleep, and awakenings. - Provides a sleep score to help you understand how sleep phases influence growth, repair, recovery, and overall well being. Smart Health Ring - Designed as a professional heart health monitor. - Equipped with high precision heart rate and SpO2 sensors to collect data and monitor your heart activity 24/7. - Analyzes the relationship between your activity and heart rate to give a comprehensive view of your physical condition. Various exercise modes and fitness viewer - Follows daily activity with high precision: steps taken, distance walked, and calories burned. - Includes exercise modes such as walking, running, and cycling. - Monitors activities and provides insights to encourage a more active lifestyle, improve performance, and help you push your limits. Waterproof and durability - 5 ATM waterproof technology for daily wear in a variety of environments. - Suitable for swimming, showering, and rainy days. - Sealed for durability and reliability, with waterproofing up to 164 feet (50 meters) in typical use. Material and comfort - Made from aluminum alloy for strength and light weight. - Very comfortable to wear, weighing approximately 2.4 grams, designed to be virtually unobtrusive. Use scenarios - Sleep optimization: Wear the ring at night to monitor sleep stages and receive insights that support recovery and daytime performance. - Training and activity tracking: Use during workouts to track heart rate, steps, distance, and calories while selecting walking, running, or cycling modes to enhance training outcomes. - Everyday wear in varied conditions: Rely on waterproof design to wear through daily activities, workouts, showers, and outdoor conditions without worry.