Ujjdwiurgh Car 4-Channel Driving Recorder Switcher Control Car Cameras IR Control Switch Combiner Box For 360° Panoramic Image

3. when the ACC product is on, your screen is blue, the product work properly. 1. we are not a switch connect the wireless camera, and can support PAL or NTSC, But don't support PAL and NTSC at the same time. 4. After installation, your camera does not work, please check the quality of your camera and your connection. Thank you. 2. Please choose a quality camera to connect. A bad camera cannot be identified by the control unit. 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