WEST BIKING Smart Sensor Bike Tail Light, 180-degree Wide Angle, IPX4 Waterproof, Dynamic LED Effects with Battery Display 1. Smart Sensing Navigation Tail Light with COB high-brightness LED core, constantly reminding vehicles or cyclists for safer riding. 2. Dual-chip system (Motion Sensor + Ambient Light Sensor) for automatic energy saving, eliminating safety blind spots. 3. Features RGB colorful dynamic flowing light effects, redefining nighttime riding aesthetics. 4. Real-time digital battery percentage + current modegear visualization, eliminating range anxiety. 5. Highly sensitive brake sensing; triggers instant 180-degree saturated red light coverage upon braking, enhancing nighttime visibility. 6. IPX4 daily waterproof rating, resilient against weather impacts. 7. Built-in vibration sensor: auto-sleeps when vehicle stops, instantly wakes upon sensing vibration. 8. Mode memory function; retains last used setting, no need to re-adjust after restart. 9. Type-C charging port, supports versatile charging methods. 10. Includes 2 mounting brackets for saddle or seatpost installation. 11. Material: Polycarbonate (PC) plastic casing. 12. Battery: 400mAh lithium battery. 13. LEDs: 31 high-brightness LED beads (Red Light version) 30 high-brightness LED beads (RGB Color version). 14. Modes: 5 modes (Red Light version) 9 modes (RGB Color version).