The rear view system includes:a monitor ,a CCD camera ,a control box. Through the rear view system you can view clearly in dark night. And you also can see the thing clearly when you back up your car. You can select one camera or two camera of the rear view system. The two camera usually used in bus,truck.one is put on the front the other is put on the back. Usually the monitor display the thing in bus but when you back up the bus it will automatically change to display the thing of your back. The rear view system is very popular in US Canada,and so on