R18 SIZE 11 Smart Ring, Support Heart Rate Blood Oxygen Sleep Care For Faimilies About Product 1. Chipset: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: around 1-2 hours 7. Waterproof: IP68 8. Size 11: Dia 20.6mm; Circumference 64.6mm 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 COMPATIBLE retail box x 1 Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store