1. We are not a switch that connects the wireless camera and can support PAL or NTSC, but does not support PAL and NTSC simultaneously. 2. Choose a quality camera to connect. A camera cannot be identified by the controller. 3. When the ACC product is turned on, your screen is blue, the product is working correctly. 4. If your camera does not work after installation, check the quality of your camera and your connection. Thank you. 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. Image sensor: 1/4 inch CCD TV system: NTSC (default) or PAL Horizontal resolution: 580 TV lines Pixels: 656 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 degrees, 95% RH maximum Storage temperature: -40 to + 105 degrees, 95% RH maximum Video cable length: approx. 6m Color: Black Material: Plastic + Metal Size: 22.5MM Package contents: 1 x Camera video controller 1 x remote control Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real thing. The allowed measurement error is +/- 1-3 cm.