Y25 Screenless BT Smart Bracelet Nylon Strap, Support Sleep Heart Rate Monitoring Exercise Data Records About Product: 1. Battery capacity: 175 mAh 2. Bluetooth version: BT5.4 3. Charging method: magnetic charging 4. System: Android system version 5.1 or above, iOS system version 8.0 or above 5. Battery life: 25-30 days of usage, 60 days of standby 6. APP: QRing 7. APP supports languages: 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 8. Dust Proof & Waterproof Level:5ATM 9. Charging time:About 1.5H Functions: 1. Exercise records: steps, distance, calorie calculation, exercise mode 2. Message reminder: flashing indicator light, APP notification, etc 3. Health management: heart rate HRV、 Blood oxygen saturation and sleep monitoring 4. Remote control for taking photos, searching for wristbands, low battery reminder, temperature measurement