R04 SIZE 7 Smart Ring, Support Heart Rate Blood Oxygen Sleep Monitoring Take Photos About Product 1. Chipset: Jeri 2. Bluetooth: 5.4 3. Sensor chip: STK8321-W 4. Battery Capacity: 15mAh(18mAh for size 9 and above) 5. Battery life: 5-7 days of use and 15 days of standby 6. Charging time: around 1.5 hours 7. Waterproof: 5ATM 8. Size 7: Dia 17.5mm; Circumference 55mm 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 Major function 1. Daily activities: Step count, distance, calorie calculation 2. Health management: heart rate measurement, blood oxygen saturation, HRV heart rate variability, stress, sleep tracking, multiple exercise modes 3. Other functions: remote control for taking photos, searching for rings, female physiological reminders Packing list: Smart ring x 1 Charging line x 1 User manual x 1 COMPATIBLE retail box x 1