R02 SIZE 8 Smart Ring, Support Heart Rate Blood Oxygen Sleep Monitoring Multiple Sports Modes About Product 1. Main Chip: RF03 2. Bluetooth: 5.0 3. Sensor chip: STK8321 4. Heart rate sensor: Vcare VC30F (Real heart rate) 5. Battery Capacity: 17mAh 6. Battery life: 5-7 days of use and 15 days of standby 7. Charging time: About 1H 8. Waterproof: IP68 waterproof 9. Size 8: Dia=18.1mm; Perimeter=56.9mm 10. Charging method: Magnetic charging 11. Compatible system: Android5.1 or above, iOS8.0 or above 12. APP: Qring (Connect the ring to the phone) 13. APP Qring support language:English, Danish, Ukrainian, Russian, Croatian, Hungarian, Hindi, Indonesian, Trkiye, 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 Packing list: Smart ring x 1 Charging cable x 1 User manual x 1 COMPATIBLE retail box x 1