O Ring Smart Ring, Fitness Trackers Rings with Sleep/Stress/Heart Rate/Women's Health Monitoring, No Subscription, Comfortable Wearing, Long Using, Fitness Ring for Android & iOS, Black-Size10

Get the Sizing Kit First The smart ring's sizing differs from standard jewelry rings. You must use the official sizing kit before purchasing wear the tester ring to confirm comfort and accuracy. This step is essential to ensure reliable heart rate and HRV tracking. Innovative Stress Tracking This fitness tracker ring monitors HRV in the background 24 hours a day, automatically quantifies stress levels, and assists you in managing stress through personalized insights. Easily track your body's responses without interrupting your daily routine. Comprehensive Sleep Management It records and analyzes deep sleep, light sleep, REM, and wake duration in detail, providing core vital signs data such as sleep score, heart rate, blood oxygen, and HRV. This transforms complex sleep information into understandable scientific advice to help you manage your sleep. One Ring, Multiple Functions One fitness ring manages all your daily health management needs: step tracking, activity tracking, mood tracking, menstrual cycle prediction for women, basal body temperature monitoring, and more. Plus, ongoing performance improvements and new feature additions deliver a customized and evolving experience. No Subscription Fee All practical and fun features are free with the companion app. It ensures you can continuously experience real-time health tracking and personalized insights. Compatible with both iOS and Android. Comfortable and Waterproof Weighing only 3 grams and crafted from durable titanium, it is 5ATM waterproof. There is no need to remove it when washing hands or showering. It is specifically designed for all-day wear, offering comfort and durability, with a stylish look that complements your outfit