This cable is for the CCD reversing camera systems that have waterproof connectors. It is 1m long and comes with a rubber O-ring on the screw fit connector. This makes the join waterproof. It is ideal for use if you have not bought a long enough cable for your reversing camera system. People often buy these to make an adaptor to convert their existing system into one which will take the more modern 4 pin aviation style connector. Please make sure your existing cable uses the same style of 4 pin connector as there are several designs in use.