Parkingcameras.com

If you see a DC power socket on a reversing camera or a monitor, probably around 99% of the time this will be a 2.1mm/5.5mm DC socket. In some circumstances you may wish to extend this cable, for example when you wish to run an RCA/Phono based camera whilst driving by taking an ignition based power supply from the front of the vehicle back to the reversing camera. This is one of our shorter length cables at 150cm, so it is probably more commonly used to extend the reversing light power supply cable from a high up position down to the rear light cluster.