1.[Choose Size & Charge the Ring Before Buy & Using It]Before purchasing the Smart Ring, Follow the way we measure the circumference of finger to choose the right ring size,It stayed in warehouse for a few weeks, due to the limited battery standby time, please fully charge when you receive the smart ring, so that it can work normally 2.[No App Subscription Needed]The fitness ring connects to your phone via Bluetooth. It monitors your and exercise data anytime, anywhere. You can manage your easily through the app without the burden of any extra subscription charges. All functions can be activated for , streamlining your management journey and ensuring a worry - experience. 3.[Comprehensive Health Monitoring]The smart ring provides an all - in - one solution for monitoring, fitness tracking, and sleep quality assessment. It continuously monitors your heart rate and blood oxygen saturation, tracks your daily exercise routine, and conducts in - depth sleep monitoring and analysis, ensuring that you are always informed about your condition. It can also accurately record your steps, distance, and calories burned, helping you achieve a ier lifestyle. 4.[Gesture Control & Convenience]The smart ring enables remote control for taking photos in JRing APP, switching short videos With a simple double-tap of your finger in the air, enjoy effortless air gesture control. 5.[5ATM ]The smart ring complies with the 5ATM waterproof standard. Whether you're washing your hands in daily life, taking a shower, or swimming in shallow water, there's no need to take off the ring. The smart ring is comfortable and lightweight, ensuring you feel completely unrestrained when you have it on.