SR2 Smart Ring Multi-function Health Monitoring Fitness Tracker Finger Ring (No Charging Case) - Silver+Gold Splicing/No.11 ?Comfortable and lightweight wearing experience sets it apart from other smart wearable products ?In multiple health modules such as exercise,heart rate,sleep,exercise,and stress. It can provide detailed insights and professional analysis to monitor your health ?The minimalist appearance surpasses the complexity of traditional wearable products. Combining fashion simplicity with elegance,both inside and outside,it is the pinnacle of both aesthetics and hardware strength ?The intelligent ring is equipped with the most efficient hardware to provide accurate information monitoring data Specifications: ?Waterproof: IP67 ?Material: Shell: titanium steel ?Weight: About 2.9g ?Chipset: Germany Dialog DA14531 ?Memory (ROM+RAM): 128kb ROM + 96kb RAM ?Expand memory: 8M ?G-Sensor: SC7A20C ?Bluetooth Version: 5.1 ?MobileAPP-GPS: Support ?Heartrate sensor: HX3602 ?Battery Type: Polymer Battery ?Operating temperature range: 0-50?? ?Battery Capacity: About 17.5mAh ?Charging time: 1 Hour ?Theory Standby time: 10-15 days ?Normal using time: 7-8 days ?Charging: magnetic charging ?Software functions and applications: ?Compatibility: Supports Android 5.0 and above versions; For Apple iOS 10.0 and above versions ?Compatible software: Working with Nova Smart Ring ?APP: JYOUPRO ?Size: ?(Thickness: 2.8mm) ? 8: Inner diameter: 18.2mm ? 9: Inner diameter: 19.0mm ? 10: Inner diameter: 19.9mm ? 11: Inner diameter: 20.7mm ? 12: Inner diameter: 21.5mm Package included: ?1 x Smart Ring ?1 x Charging Cable ?1 x English User Manual