Fangrui Product Details 1. R20 Size 13 Smart Ring, Support Heart Rate Blood Oxygen Sleep Monitoring Multiple Sports Modes 2. About Product 3. Chipset: Ac6323 4. Bluetooth: 5.0 5. Sensor Chip: Sc7a20h 6. Battery Capacity: 15mah 7. Battery Life: 3-5 Days Of Use And 7-10 Days Of Standby 8. Charging Time: About 1-2h 9. Waterproof: Ip68 10. Size 13: Dia 22.2mm; Circumference 69.7mm 11. Charging Method: Magnetic Charging 12. Compatible System: Android5.1 Or Above, Ios8.0 Or Above 13. App: Smart Health 14. App Support Language:english, Simplified Chinese, Traditional Chinese, Russian, Ukrainian, German, French, Italian, Spanish, Portuguese, Polish, Greek, Romanian, Hungarian, Czech, Slovak, Irish, Croatian, Swedish, Danish, Finnish, Arabic, Farsi, Norwegian, Japanese, Korean, Thai, Vietnamese 15. Function: 16. Steps, Miles, Calories, Motion Data Recording 17. Heart Rate Monitoring, Blood Pressureblood Oxygen Monitoring, Sleep Monitoring, Body Fatigue Assessment 18. Multiple Exercise Modes:running, Cycling, Skipping, Hiking, Mountaineering, Yoga, Golf, Dancing 19. Packing List: 20. Smart Ring X 1 21. Charging Cable X 1 22. User Manual X 1 23. Compatible Retail Box X 1