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Get the Sizing Kit FirstThe sizing of this smart ring is different from standard jewelry rings. You need to use the official sizing kit before buying wear the tester ring to verify comfort and fit. This step is essential to ensure accurate heart rate and HRV tracking. Innovative Stress TrackingThis fitness tracker ring monitors HRV in the background around the clock, automatically measures stress levels, and assists you in managing stress with personalized insights. Effortlessly track your body's responses without interrupting your daily routine. Comprehensive Sleep ManagementThe ring captures and examines deep sleep, light sleep, REM, and wake time in detail, delivering key vital signs data like sleep score, heart rate, blood oxygen, and HRV. It transforms complex sleep data into clear scientific guidance to help you manage your sleep. One Ring, Multiple FunctionsA single fitness ring addresses all your daily health management needs: step counting, activity monitoring, mood tracking, menstrual cycle prediction for women, basal body temperature measurement, and more. Additionally, ongoing performance enhancements and new feature updates offer a tailored and evolving experience. No Subscription FeeAll useful and enjoyable features are included free with the companion app. It works with both iOS and Android. Comfortable and WaterproofWeighing just 3 grams and crafted from durable titanium, it is 5ATM waterproof. You do not need to take it off when washing hands or showering. It is specifically designed for all-day wear, providing comfort and durability, with a stylish appearance that matches your outfit