【Check the Size Before Purchase】 Before buying the BIEMHA Smart Ring, we strongly suggest that you refer to the size chart and carefully measure the circumference of your finger. This will ensure you get the most comfortable wearing experience and easily avoid any unnecessary returns or exchanges. 【Real-time Accurate Sleep & Fitness Monitoring】 BIEMHA smart ring tracks your sleep quality and daily activities in real time. With advanced sensors, it provides precise data about your sleep cycle, helping you optimize rest and recovery. Whether you are tracking steps, calories or exercise performance, this smart ring can provide you with the most accurate insights to support your fitness goals and enhance your overall health.It is a good choice for family and friends. 【Health Monitoring】The BIEMHA ring features advanced 4.0 sensors that automatically measure your heart rate, and blood pressure every 30 min when worn. It provides continuous health tracking and comprehensive wellness management all day. 【3-5 Day Battery Life】 With a 3-5 day battery life, the BIEMHA smart ring ensures continuous health monitoring without frequent charging. When used with the smart charging case, the usage time can even exceed 20 days. Whether you are tracking sleep patterns or fitness activities, you can count on long-lasting performance without constant interruptions. 【80-meter Waterproof, Suitable for Various Scenarios】 The BIEMHA Smart Ring has excellent waterproof performance, with a waterproof depth of up to 80 meters. Whether it's for daily wear, an intense workout session or a pleasant swimming time, it can handle it with ease. What's more, even if you have sensitive skin, you can still enjoy an extremely comfortable wearing experience when wearing this ring. 【No APP Subscription Required】 Say goodbye to hidden fees! The BIEMHA smart ring does not require any APP subscription, giving you full access to all its features without ongoing payments. Just wear it and track your health and exercise metrics, everything is a breeze. Smart Ring for Women & Men, Health Tracker with Sleep，Exercise Monitoring, iOS&Android Compatible, IP68 Waterproof, No Subscription, 5-Day Battery