It's a standard waterproof switch usually used on boats. Use a single-throw. It's basically a button that doesn't click to stay on. You can puchase one at radio-shack and they come as small as a 1/2 inch in length with a o.d. of less than that. I would recommend finding a unique place to HIDE it. For example: Inside a fender or anywhere underneath the car. Be creative and don't tell anyone. Remember, this button is a safety feature but it also creates a loop-hole in security. When I had my B2000 hooked up, I had one installed behind one of the tail-lights to where I would just need a screw-driver to get to it.