Please Measure Size Before Buying Before purchasing your Oucscru smart ring, we strongly recommend that you refer to the size chart and measure the circumference of your finger to ensure the most comfortable fit and to avoid unnecessary returns or exchanges Real-time Health Tracking Smart Ring Smart rings monitors heart rate, blood oxygen levels, sleep patterns, and daily activity in 24 hours a day with detailed metrics and analysis, helping you manage your physical health indicators Intelligent Sleep Monitoring Sleep ring tracks deep sleep, light sleep, and REM cycles with detailed sleep quality analysis and duration measurements, You can view various metrics in the app at any time and adjust your lifestyle based on the reports Extended Battery Life & Multiple Charging Options After Health Tracker Ring is fully charged, it can be used continuously for up to 5-7 days,Features a 300mAh charging case for outdoor use and convenient USB charging capability for indoor charging Remote Photography & Family Care Supporting the remote photo function, users can remotely control the phone to take photos when needed. Just shake your finger twice quickly and the shutter button will be pressed, The SmartHealth app Allows multiple family members to share health data through connected accounts for comprehensive family health monitoring Lightweight & Durable Design 2mm thickness with a specially polished inner surface rating ensures the ring can Comfortable for everyday wear while tracking fitness and health metrics IP68 Waterproof & Ring Protector The Fitness Ring With an IP68 waterproof rating. Whether it's daily hand washing, showering, or swimming and diving can be worn, support depth waterproof, Ring protector protects your ring from knocks in daily life, fitness, outdoor sports.