I put a small switch under the cover, I already had one and it fit right in. That switch wires to a dual USB charger that I also already had, but it was too big to fit in that spot, so for now it's just loose in the car. The switch is just big enough that closing the lid shuts it off, allowing me to not drain the battery if someone forgets to unplug something. I saw a dual USB setup on an AC Cobra, it was sort of clipped to the side of the center console. I was going to copy that as soon as I figured out where to get the clip.