Custom Dynamics CD-ALT-BS-UNV Alternating Brake Strobe Module

Plug-and-play brake strobe module takes alerting traffic behind you to the next level. Compatible with add-on custom LED lighting (such as Custom Dynamics LED Boltz PART 2040-2838 and 2040-2839) when used as left and right side rear brake lights. Does not affect OEM rear brake lights. When the brake is applied, the programmed flash or strobe pattern will alternate between left and right side lighting accessories creating an eye-catching pattern.