(1)we don't surggest the switch will be connect wireless camera,and all product can support PAL or NTSC
,but don't support PAL and NTSC at the same time.
(2),please select good quality camera to connect. Poor camera can't be identify by control box.
(3)when the product ACC on,Your screen is blue ,The product will work properly.
after you install ,your camera don't work, please check your camera's quality and your connection.thanks.
Car Camera Video Control Box For Four Channels With Quad Split ,With Mirror Switch For Each Camera
You can see 4 camera's images in a same window