Custom Dynamics Magic Strobe Brake Light Modulator For Harley Fxdr, Fxlr, Flde, Flhc The Custom Dynamics Brake Light Strobe Modulator allows you to choose between 10 different flash patterns so you can make the most of your brake lights! Features: 10-user selectable flash/strobe patterns Over-current/thermal/short circuit/reverse wiring protection 84W, 12V system Sealed weather-tight case 2-1/4 L x 1-1/4 W x 5 H