My son has an in car dvd player with two screens. He has never used it, cos he cant be bothered to set it up, I dont know what cable joins the two screens together. I get one screen working, but am unsure of what cable to use. Please help me someone…

in the box there should have been a yellow cable ( video ). plug one end into the OUTPUT of the main unit, plug the other into the INPUT of the other. As both users will have headphones ( sound ) all you need is this cable

hope this helps wg