The Rear Vision Mirror kits include a two camera suzie cable so that two cameras can be installed on the back of the caravan providing two different viewing angles. One camera as a reversing camera and the other to use as a rear view camera whilst driving along.  The suzie cable includes the spring section and two 0.8m cables. Two extension cables attach to the 0.8m cables and run from the monitor to the back hitch of the car connecting with the spring. Then another two extension cables run from the spring connection to the cameras on the back of the caravan. The spring section is the part that is unplugged when not towing the caravan.