This system is mainly used for trucks, trailers, buses and other alike heavy duty vehicles. It includes 1 quad monitor ( it can be selected to display full, split, triple or quad pictures ) and 2 night vision camera ( actually, you can choose 1 to 4 cameras in this system ). The cameras can be installed on the front, back, both sides or even inside the container of the tralier as you need. Monitor will automatically switch to display the full picture while parking, turnning left or right. We can also offer you cables or plug brackets for connecting the monitor and the camera according to your requirement.