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One side connects to the 7-pins plug of a trailer and the other side to the 7-pins socket of the towing vehicle Indicates any failures in the wiring circuits on the car or trailer For use with 7 pole plugs and sockets and includes adaptors for 13 pin plugs and sockets Can be used with trailers, caravans, horseboxes, bicycle carriers etc. Requires 1 x 9V PP3 battery (not included)