Fangrui Product Details 1. R3 Size 20 Smart Ring, Support Heart Rate Blood Oxygen Sleep Monitoring 2. About Product 3. Cpu: Compatible Phase 2860 4. Bluetooth Version: Ble 5.1 5. Battery Capacity: 18 Mah 6. Standby Time: About 45 Days 7. Working Time: About 3-5 Days 8. Charging Time: 0.5 Hours 9. Acceleration Sensor: Qma6100p 10. Heart Rate Sensor: Hx3605 11. Charging Cable: Magnetic Charging Cable With Patch Protection Ic 12. Waterproof Level: Ip68 13. Charging Requirements: Charging 1a Or Less 14. App: Nx Ring 15. App Supports Languages: Chinese, English, Japanese, Korean, German, French, Spanish, Arabic, Russian, Italian, Portuguese, Hindi, Ukrainian, Polish, Dutch, Malay, Greek Arabic, Indonesian, Turkish, Slovak, Czech, Thai, Romanian, Xhosa, Slovenian, Greek, Hungarian, Vietnamese, Lithuanian, Urdu, Bulgarian, Croatian , Latvian, Estonian, Swedish, Khmer, Danish, Bengali. 16. System Requirements: Android5.0+ Ios10.0+ 17. Size 20 (inner Diameter And Circumference 62.1mm) 18. Functions: Supports Heart Rate Detection, Blood Oxygen Detection, Sleep Monitoring (sleep Time, Sleep Quality), Body Temperature Detection, Remote Photography, Multiple Exercise Modes, Step Counting, And Synchronization Of Data To Apkapp 19. Packing List: 20. Smart Ring X 1 21. Charging Cable X 1 22. Instructions X 1