SR08 Digital Display Smart Ring Sleep Tracker Blood Oxygen Heart Rate Monitor Ring with Charging Case - Bright Silver/Size 12 •【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 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 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