The smart ring uses a medical-grade chipset that can accurately monitor multiple biological characteristics such as step count, sleep, heart rate, HRV, blood oxygen, blood pressure, temperature, etc., making your health data more accurate and intuitive than ever before. The ring innovatively introduces blood pressure, finger temperature and female menstrual cycle detection to accompany you to have a healthy and beautiful day.(Durable and waterproof, widely compatible) The smart ring has excellent 5ATM water resistance, allowing you to easily cope with wet environments such as swimming, diving, and showering. It is compatible with both Android and IOS devices, and seamlessly integrates with a variety of common apps such as Apple Health and Google Health.(Long life,easy to wear) Designed for 24/7 all-weather wearing, it is lighter and more comfortable than the traditional ring, pure titanium material, with a better fit, no allergies, so that you can freely forget about its existence, making health monitoring easy and day and night. By default, the smart ring is equipped with a powerful magnetic charging case, which can recharge the ring repeatedly, and the battery life of each charge is up to 4-5 days, which brings a long battery life to health.(Measure the size accurately before purchasing) 's smart rings come in 7 sizes, which is important, from 7 to 13. Please measure your finger size strictly according to the illustrated method before purchase to ensure a perfect fit. (Attached is the detailed picture of the measurement method)