This Brake Flasher is applied to flashing your car's brake light to catch the sight of drivers' attraction, especially in bad visibility, raining, misty, or smoky conditions. Comparing with normal brake lights, the flashing brake lights help to avoid rear-end collisions more. This unit is easy to be installed, fashion style and the flashing speed is adjustable with turning the knob. The patent series number is ZL200830147729.7 and one year warranty