Fangrui Product Details Advanced Health Monitoring: Keep Track Of With Our Cutting-edge R02 Smart Ring. It Offers Comprehensive Health Tracking Including Heart Rate, Sleep Analysis, And More, Ensuring You Stay On Top Of Your Wellness. And Robust: This Smart Ring Is Designed To Withstand The Toughest Conditions While Maintaining A Sleek And Stylish Look. Waterproof Excellence: With Ip68 Waterproof, The R02 Smart Ring Is Your Companion For Any Adventure, Capable Of Handling Depths And Conditions Where Others Cant. Multi-sport Functionality: Whether Youre Running, Swimming, Or Cycling, The Rings Multi-sport Modes Accurately Track Your Activity, Helping You Achieve Your Fitness Goals. Universal Compatibility: Seamlessly Connect With Both For Android And Ios Devices, Ensuring Youre Connected, No Matter Your Smartphone Preference. App:qring Main Control Chip: Rfo3 Bluetooth: 5.0 Battery Capacity: 17mah Waterproof Grade: Pi68 Charging Method: Magnetic Charging Colour:tin Color Material:stainless Steel Size:no.8 18.1mm