Key benefits - Continuous health insight: 24/7 heart rate and blood oxygen (SpO2) monitoring gives you objective data to spot trends and make informed decisions about activity, rest and recovery. - Better sleep understanding: automatic tracking of deep sleep, REM, light sleep and wakefulness with a sleep score helps you see how restorative your nights are and identify habits to improve sleep quality. - Fitness motivation and accuracy: precise step, distance and calorie tracking plus dedicated modes for walking, running and cycling let you measure progress and push performance responsibly. - Durable, everyday wear: lightweight aluminum alloy construction and 5ATM waterproofing let you keep the ring on for workouts, showers and swimming without worrying about damage. How it solves problems - Replaces guesswork with data: instead of estimating exertion or recovery, the ring records heart rate and activity continuously and correlates them to give a clearer picture of fitness and stress. - Improves sleep habits: sleep stage breakdown and an overall sleep score help you identify when you are getting insufficient deep or REM sleep so you can adjust schedule or routines. - Tracks performance reliably: multi-sport modes and accurate activity metrics make it easy to compare sessions, set targets, and improve over time. Key features - Heart and oxygen monitoring: high-precision, high-performance sensors for continuous heart rate and SpO2 measurement. - Sleep monitoring and scoring: detects deep sleep, REM, light sleep and wakefulness and produces a sleep score for each night. - Activity and fitness tracking: counts steps, distance and calories burned with high accuracy. - Exercise modes: supports walking, running and cycling; activity is tracked and scored to encourage improvement. - Smart analysis: the ring analyzes the relationship between activity and heart rate to provide a more complete view of your condition. - Waterproof rating: 5ATM waterproof construction (rated to 164 feet) for swimming, showering and daily water exposure. - Comfort and materials: made of aluminum alloy, very lightweight at 2.4 grams for comfortable all-day and night wear. How to choose your size 1. Measure your finger circumference following the sizing instructions on the product details page. 2. Convert that circumference to your finger’s inner diameter (use the provided formula or chart on the details page). 3. Select the corresponding ring size number from the available sizes. Use scenarios - Sleep optimization: wear the ring overnight to receive a sleep stage breakdown and a sleep score that shows whether you achieved sufficient deep and REM sleep. - Training session review: use the running or cycling mode during workouts to record heart rate response, distance and calories, then review the activity score to track progress. - All-weather everyday tracking: keep the ring on while showering, swimming, commuting or working to capture continuous heart and activity data without removing it. Specifications (concise) - Sensors: high-precision heart rate and SpO2 sensors - Monitoring: 24/7 heart rate and oxygen saturation tracking; sleep stage detection and sleep score - Activity: steps, distance, calories; walking, running, cycling modes - Waterproof: 5ATM (up to 164 feet) - Material: aluminum alloy - Weight: 2.4 grams What makes it stand out - Continuous, linked health signals (heart rate + activity + sleep) produce actionable insight rather than isolated measurements. - Lightweight aluminum design minimizes discomfort during all-day and overnight wear. - Full waterproofing and sealed construction let you use the ring across daily activities and workouts without interruption. Compatibility and care - Follow the included sizing instructions before purchase to ensure an accurate fit. - The ring is designed for daily wear; rinse with fresh water after heavy pool or saltwater exposure and dry thoroughly. - Refer to the product details page for device pairing and app compatibility instructions.