About Product 1. Main Chip: DA145352. Bluetooth: 5.33. Sensor chip: Miramems da 2674. Battery Capacity: 15m. Ah 5. Battery life: 5-7 days of use and 15-20 days of standby 6. Charging time: About 1-2 hours 7. Waterproof: IP68 waterproof 8. Size 22: Dia=21.8mm; Circumference=68.4mm 9. Charging method: Magnetic charging 10. Compatible system: Android 5.1 or above, iOS8.0 or above 11. APP: Luck. Ring 12. APP support language:Danish, Ukrainian, Russian, Croatian, Hungarian, Hindi, Indonesian, Turkish, 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. Original retail box x 1