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How to Select the Correct Size Before purchasing the Smart Ring, we strongly advise buying the Size Measuring Kit first to determine your ideal finger fit. Prepare a non-stretch paper strip, wrap it firmly around both your finger base and knuckle, mark each overlap, measure, and utilize the larger length to identify your ring size. Premium Materials Made from a robust combination of epoxy resin and stainless steel, this smart ring for women effectively resists scratches. It features an IP68 waterproof rating. Experience an impressive 35 days of continuous use per full charge, along with extended standby time. It offers dual charging optionsa portable charging case and USB chargingto keep your health ring energized anytime, anywhere. Complete Body Monitoring for an Active Lifestyle This fitness ring tracker is designed for both men and women, delivering complete health tracking. It consistently monitors your key vital signs, such as heart rate, blood oxygen, and HRV, in addition to your sleep patterns. It also automatically records your daily activities like steps taken and calories burned. Obtain deeper insights into your health and enhance your fitness routine. Advanced Sleep Tracking This smart ring health tracker offers a detailed analysis of all your sleep stages, including sleep quality scores, deep sleep, light sleep, and REM sleep cycles, assisting you in preparing for the new day. It also monitors your sleep trends over a week, enabling you to comprehend your overall sleep quality and pinpoint areas for improvement. Via precise, personalized sleep analysis, it enhances your rest and recovery. This smart ring for women and men is compatible with Android 5.1 (Includes) and iOS 8.0 (Includes) and later systems. Remote Camera Control Its innovative remote camera control function allows you to capture photos easily by simply waving your hand, perfect for capturing life's special moments. We are dedicated to delivering a high-quality wearable device experience with no app subscription fees