Some of the cameras support multiple signal type. The cameras are preset to TVI signal model as factory default mode. If you have accidentally changed it, here's how to change it back. Press and Hold the switch button for 5 seconds to switch the video output. It'll cycle through to the next video output when you press and hold the switch button. There's 4 kinds of video outputs available:- TVI, AHD, CVI, CVBS.
