If you have a  John Deere GEN 4 or GEN 5 monitor and your tractor or combine is not prewired, this kit has a camera with a magnet, a 30 ft cable, and a 4-input harness that can connect up to 4 cameras on one end and a 26 pin connetor that plugs into the back of a GEN 4 or GEN 5 monitor. Includes a power supply as well.