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, Silver-Size10

Get the Sizing Kit First: The smart ring's sizing differs from standard jewelry rings. You must use the official sizing kit before purchasingwear the tester ring to confirm comfort and accuracy. This step is essential to ensure reliable heart rate and HRV tracking. Innovative Stress Tracking: The fitness tracker ring monitors HRV continuously throughout the day, automatically quantifies stress levels, and assists you in managing stress with 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 needsstep tracking, activity tracking, mood tracking, menstrual cycle prediction for women, basal body temperature monitoring, and more. Additionally, ongoing performance improvements and new feature additions deliver a personalized and evolving experience. No Subscription Fee: All practical and enjoyable 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, crafted from durable titanium, and rated 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 appearance that complements your outfit