WEST BIKING Bicycle USB Charging Smart Brake Sensor Warning Tail Light 1. Material: PC+ABS 2. Lamp bead: bright LED lamp bead 3. Battery: 500mAh 4. Mode: 7 modes 5. Waterproof grade: IPX-6 6. Features: Intelligent Light SensingBrake SensingUSB Charging6 Lighting ModesWaterproof, etc. 7. Brake sensing, only light sensing, tap for automatic mode long press for 3 seconds to boot into manual mode 8. Ambient light sensing, safer riding 9. Using USB charging, 500mAh battery USB charging, to meet the daily battery life 10. Use time: about 15 hours with low light, about 10 hours with medium light, about 6 hours with high light, about 30 hours with low power and slow flash, about 20 hours with high power and slow flash, and about 16 hours for breathing 11. ABS plastic shell, lightweight material, no need to increase riding burden 12. IPX6 high-efficiency waterproof travel in rainy days, not afraid of wind and rain 13. Two installation methods, suitable for different bicycles and cycling scenes 14. Weight: about 24 grams (without bracket) 15. Product size: lamp diameter 37 mm, length 42 mm; base height 9 mm, length 53 mm, long bracket 118 mm