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-Size12

This smart ring features a unique design that differs from standard ring sizes. Use the included sizing kit to find your perfect size and test-wear it for 24 hours to ensure all-day comfort. This fitness tracker ring monitors HRV in the background 24 hours a day, automatically quantifies stress levels, and helps you manage stress through personalized insights. Easily track your body's responses without disrupting your daily life. 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 turns complex sleep information into understandable scientific advice to help you manage your sleep. This fitness ring handles all your daily health management needs, including step tracking, activity tracking, mood tracking, menstrual cycle prediction for women, basal body temperature monitoring, and more. Continuous performance improvements and new feature additions provide a customized and evolving experience. All practical and fun features are free with the companion app. It ensures you can continuously experience real-time health tracking and personalized insights. The ring is compatible with both iOS and Android devices. Weighing only 3 grams and made of durable titanium, it is 5ATM waterproof, so there's 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