R20 SIZE 8 Smart Ring, Support Heart Rate Blood Oxygen Sleep Monitoring Multiple Sports Modes About Product 1. Chipset: AC6323 2. Bluetooth: 5.0 3. Sensor chip: SC7A20H 4. Battery Capacity: 15mAh 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 8: Dia 18.1mm; Circumference 56.9mm 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 Function: 1. Steps, miles, calories, motion data recording 2. Heart rate monitoring, blood pressure，blood oxygen monitoring, sleep monitoring, body fatigue assessment 3. Multiple exercise modes:running, cycling, skipping, hiking, mountaineering, yoga, golf, dancing Packing list: Smart ring x 1 Charging cable x 1 User manual x 1 COMPATIBLE retail box x 1