R11C SIZE 13 Smart Ring, Support Heart Rate Blood Oxygen Sleep Monitoring Multiple Sport Modes About Product 1. Chipset:Realtek 2. Bluetooth: 5.2 3. Sensor chip: ST LIS2DOC 4. Battery Capacity: 15mAh (18mAh for size 11 and above) 5. Battery life: 5-7 days of use and 15 days of standby 6. Charging time: around 1.5 hours 7. Waterproof: 1ATM 8. Size 13: Dia 22.3mm; Circumference 70mm 9. Charging method: Magnetic charging 10. Compatible system: Android5.1 or above, iOS8.0 or above 11. APP: QRing 12. APP support language:Danish, Ukrainian, Russian, Croatian, Hungarian, Hindi, Indonesian, Türkiye, Hebrew, Greek, German, Italian, Latvian, Czech, Slovak, Slovenian, Japanese, French, Polish, Thai, Estonian, Swedish, Lithuanian, Simplified Chinese, Traditional Chinese, Romanian, English 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 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.