Fangrui Product Details 1. R03 Size 11 Smart Ring, Support Heart Rate Blood Oxygen Sleep Multiple Sports Modes 2. About Product 3. Main Chip: Rf03 4. Bluetooth: 5.0 5. Sensor Chip: Stk8321 6. Battery Capacity: 15mah 7. Battery Life: 5-7 Days Of Use And 15 Days Of Standby 8. Charging Time: About 1h 9. Waterproof: 5atm 10. Size 11: Dia 20.8mm; Circumference 65.4mm 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. Packing List: 16. Smart Ring X 1 17. Charging Cable X 1 18. User Manual X 1 19. Compatible Retail Box X 1