Choose from 2, 3, or 4-circuit heavy duty 115W light dimming systems. Circuit board design with pin connector allows for easy and neat wiring. Supplied with needed Mil Spec Tetzel color-coded wire. Unlike rheostats, this system will provide even dimming of incandescent lights, electroluminescent lamps (such as the SPT Glow Strips) and LEDS when used in combination on the same circuit. Separate control switch (with circuit breaking off position) included for each circuit. Knobs sold separately.