Fangrui Product Details 1. R04 Size 8 Smart Ring, Support Heart Rate Blood Oxygen Monitoring Sleep Take Photos 2. About Product 3. Chipset: Jeri 4. Bluetooth: 5.4 5. Sensor Chip: Stk8321-w 6. Battery Capacity: 15mah(18mah For Size 9 And Above) 7. Battery Life: 5-7 Days Of Use And 15 Days Of Standby 8. Charging Time: Around 1.5 Hours 9. Waterproof: 5atm 10. Size 8: Dia 18.3mm; Circumference 57.5mm 11. Charging Method: Magnetic Charging 12. Compatible System: Android5.1 Or Above, Ios8.0 Or Above 13. App: Qring 14. App Support Language:danish, Ukrainian, Russian, Croatian, Hungarian, Hindi, Indonesian, Türkiye, Hebrew, Greek, German, Italian, Latvian, Czech, Slovak, Slovenian, Japanese, French, Polish, Thai, Estonian, Swedish, Lithuanian, Simplified Chinese, Traditional Chinese, Romanian, English Dutch, Portuguese, Spanish, Vietnamese, Arabic, Korean, Malay 15. Major Function 16. Daily Activities: Step Count, Distance, Calorie Calculation 17. Health Management: Heart Rate Measurement, Blood Oxygen Saturation, Hrv Heart Rate Variability, Stress, Sleep Tracking, Multiple Exercise Modes 18. Other Functions: Remote Control For Taking Photos, Searching For Rings, Female Physiological Reminders 19. Packing List: 20. Smart Ring X 1 21. Charging Line X 1 22. User Manual X 1 23. Compatible Retail Box X 1