15m/49ft 4-Pin Extension cable for Long Bus Truck Trailer RV Van Motorhome Schoolbus Camper Lorry 5th wheel and All other heavy Duty Monitor will automatically switch for V2 when the reversing gear is selected( Monitor blue cable need to connect for gearbox reversing trigger+) 4Pin 7inch TFT LCD monitor high resolution image (800x480 Pixels), full color display and low power consumption, adjustable brightness, contrast and color. Image can be rotated horizontally and vertically for mirror or none mirror viewing with 2 channel video input,V1/V2 button switch,2 connect plug,V2 is remote by Blue wire for reversing use priority