This is the FOUR wire version of this light. See related items for the three wire style. These lights are wired with three male bullet style plugs – ground, hot, and turn signal, to light the red side, plus an additional male bullet plug that powers the white diodes. The red color is dual function and can be used as a marker as well as a turn signal. The white color is a single function, only. Requires a 3/4″ hole to install. Includes chrome bezel.