The switch is a sweet setup, When you arm the NOS the switch also turns on your air shifter. Then the starter button activates the NOS, the horn button activates the air shifter. The switch comes in a big ugly plastic box with double face tape to mount it. I left mine hanging until i get a chance to take the actual switch out it and mount in a good spot. You only have to cut two wires (the horn and the starter) then hook each cut end of the wire to two wires on the MPS switch and it's ready to go.