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> 4. After installation, your camera does not work, please check the quality of your camera and your connection. Thank you.<br> 5. 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<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> Colour:Black<br> Material:Plastic+Metal<br> Size:22.5MM<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 reflection 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.