Advanced Sleep Tracking Monitor your sleep patterns,heart rate,and blood oxygen levels with precision using the intelligent ring design Durable Construction Crafted with stainless steel and featuring IP68 waterproofing for long-lasting performance in various conditions Extended Battery Life Enjoy 3 - 4 days of normal use or 16 - 20 days of standby time with the efficient polymer cobalt battery Comprehensive Health Monitoring Track multiple sports modes,heart rate,sleep quality,and blood oxygen levels with ease Seamless Connectivity Bluetooth-compatible 5.1 technology ensures stable connections with compatible devices for real-time data syncing Specifications: Material: Stainless steel+glue filling process Thickness: 2.5mm Waterproof Rating: IP68 Chipset: German Dialog DA14585 (ultra-low power consumption) Memory: 128kb ROM+96 Kb RAM G-Sensor: SC7A20 Bluetooth-compatible Version: 5.1 Heart Rate Sensor: Tianyi 3918 Battery Type: Polymer pure cobalt battery Battery Capacity: 216mAh Charging Time: 2 hours Operating Temperature Range: 0-50 Compatibility: for Android 9.0 and above; iOS 10.0 and above Compatible Software: Jring Package included: 1 x Ring 1 x Charging Case 1 x English User Manual