Fangrui Product Details 1. R02 Size 11 Smart Ring, Support Heart Rate Blood Oxygen Sleep Monitoring Multiple Sports Modes 2. About Product 3. Main Chip: Rf03 4. Bluetooth: 5.0 5. Sensor Chip: Stk8321 6. Heart Rate Sensor: Vcare Vc30f (real Heart Rate) 7. Battery Capacity: 17mah 8. Battery Life: 5-7 Days Of Use And 15 Days Of Standby 9. Charging Time: About 1h 10. Waterproof: Ip68 Waterproof 11. Size No.11: Dia=20.6mm; Perimeter=64.6mm 12. Charging Method: Magnetic Charging 13. Compatible System: Android5.1 Or Above, Ios8.0 Or Above 14. App: Qring (connect The Ring To The Phone) 15. App Qring Support Language:english, 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, Dutch, Portuguese, Spanish, Vietnamese, Arabic, Korean, Malay 16. Packing List: 17. Smart Ring X 1 18. Charging Cable X 1 19. User Manual X 1 20. Compatible Retail Box X 1