The S4 kit just comes with a on off. You add the datadim kit to get the Hi-Lo off switch. Or you get the DialDim to have off and it cdn increase by 15% each notch on the dial. The DialDim has signal wires that you tap into your turn signals/horn/HighBeam for other features. You can wire so when you honk your fog lights can strobe at the same time, flip high beam it will go to full intensity etc. it also is ready to plug in another set of lights and also control them off the same dial.