As we all probably know, having a video screen in front of the driver while the car is in motion is illegal, well it is in Canada anyways. So with this unit, you were supposed to wire it in to the foot brake and hand brake, and with of a combination of presses and pulls, the DVD/Video option would be engaged, as the system would know the vehicle is not in motion. Well, after figuring out what wires needed what power, my friend and I installed these two little red buttons, one acting as my hand brake and the other as my foot brake. So, while holding one, and pushing the other one on and off, then releasing both, I have full access to my DVD/Video function whenever I please. These buttons are hidden behind a dash panel that easily pops off and on, no visible alterations.