R11M SIZE 9 Smart Ring, Support Heart Rate Blood Oxygen Sleep Multiple Sports Modes About Product 1. Main Chip: AC6323 2. Bluetooth: 5.0 3. Sensor chip: SC7A20H 4. Battery Capacity: 20mAh 5. Battery life: 3-5 days of use and 7-10 days of standby 6. Charging time: About 1-2H 7. Waterproof: IP68 8. Size 9: Dia 18.9mm; Circumference 59.5mm 9. Charging method: Magnetic charging 10. Compatible system: Android5.1 or above, iOS8.0 or above 11. APP: Smart Health 12. APP support language:English, Simplified Chinese, Traditional Chinese, Russian, Ukrainian, German, French, Italian, Spanish, Portuguese, Polish, Greek, Romanian, Hungarian, Czech, Slovak, Irish, Croatian, Swedish, Danish, Finnish, Arabic, Farsi, Norwegian, Japanese, Korean, Thai, Vietnamese Packing list: Smart ring x 1 Charging cable x 1 User manual x 1 Original retail box x 1