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AI Smartwatch bicycle and they're perfect for safetyDescriptions: 1. Product model: B57 smart bracelet 2. Chip: NRF52832 3. Bluetooth: BT4. 0 4. Compatible system: Android 4. 4 and above, IOS 9. 0 or above 5. Waterproof rating: IP67 6. Screen: 1. 3 inch IPS color Resolution: 240*240 7. Touch: Single touch 8. Battery: 180 mAh 9. Charging: Magnetic charging 10. Charging time: about 1. 5H 11. Standby: 25 days or so Working time: 7 days or so 12. Bracelet material: PC case + plastic case 13. Product size: