The modulator flashes the Ryker brake lights 3 times rapidly each time you press on the brakes, giving you maximum alert visibility from the rear.  Easy install with plug and play OEM harness, just remove the taillight, unclip the factory harness and plug in this new harness inline and you are done!  

Best part about this module is, when you add future rear brake lights it will modulate those additional lights also.  

See 2 other new items: Ryker Under rear seat run/brake /turn LEDs and License plate LED reflectors.