Bike Burglar Alarm with Tail Light, Anti Theft Vibration Triggered Siren Waterproof Smart Auto Brake Sensing Rear Light

4-in-1 function: Taillight, brake light, anti-theft alarm, and bike bell in one device. Smart light function: Automatically turns on in dark environments or tunnels, and highlights brake light when braking. Anti-theft protection: Deters thieves with loud alarm and blinking light when armed. Safety warning system: Alerts surrounding pedestrians and drivers with light and sound for enhanced safety. Waterproof and dustproof design: Resists water, dust, rays, and extreme temperatures for long-lasting use.