This is a replacent board for hw plug-and-play transmitters, or make your non plug and play transmitter to a plug play version. Do It Yourself (DIY).
This replacement plug-and-play boards have regulated 12V output, to power 12V Cameras. The power input port (plug) is reversed-polarity protected, you can't damage it if you accidently plug reversed power.
Size: 38.1mm x 25.4mm