R18 SIZE 13 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 13: Dia 22.2mm; Circumference 69.7mm 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