R3 SIZE 20 Smart Ring, Support Heart Rate Blood Oxygen Sleep Monitoring About Product 1. CPU: Original phase 2860 2. Bluetooth version: BLE 5.1 3. Battery capacity: 18 mAh 4. Standby time: about 45 days 5. Working time: about 3-5 days 6. Charging time: 0.5 hours 7. Acceleration sensor: QMA6100P 8. Heart rate sensor: HX3605 9. Charging cable: magnetic charging cable with patch protection IC 10. Waterproof level: IP68 11. Charging requirements: charging 1A or less 12. APP: Nx RING 13. 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. 14. System requirements: Android5.0+ iOS10.0+ 15. Size 20 (inner diameter and circumference 62.1mm) 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 Packing list: Smart ring x 1 Charging cable x 1 Instructions x 1