4.5 inch CRT 1.deflection angle:90d 2.working voltage:11V--32V 3.automatic/manual turn on 4.day/night illumination mode 5.adjustable contrast/illumination two cameras car be connected,1 video input port,1 video output port 6.with the function of double-circuit compulsive switch over of signal input 7.video int/out put:1.0Vp-p+/- 20 8.power consumption of less than 10W 9.with an electronic scale displayed on the screen 10. operating temperature:-20tem--60tem