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