(1) we are not a switch will connect the wireless camera, and can support or NTSC , 't support and NTSC at the same time. (2) a quality camera to connect. A camera cannot be identified by the control unit. (3) when the product is on, your screen is blue, the product will work properly. After installation, your camera does not work, check the quality of your camera and your connection. . Four-channel car video controller with four-door partition, with a mirror switch for each camera You can see 4 camera images in one window Size: 22.5MM Image Sensor: 1/4inch CCD TV system: NTSC(Default) or Horizontal Resolution: 580 TV lines Pixels: 656(H) x 592(V) Sync. System: internal S Ratio: 48dB Night Vision: Yes Electronic Shutter: 1/60 to 1/100,000 seconds Video Output: 1.0Vpp, 750hm White Balance: Auto Power: DC 12V Operating Temperature: -40 to + 80 degree, 95% RH maximum Storage Temperature: -40 to + 105 degree, 95% RH maximu Video Cable Length: about 6m Material:plastic colour:Black Package Contents: 1 x Camera Video Control 1 x remote control Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.