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[Clever Gadget and Time Saver for Trailer Owners] Designed to indicate the failure in the wiring circuits on both towing vehicles and trailers, quickly provides information to find the source of the problem [Easy to Operate] Trailer tester for 7 pins plug socket connection, with a 7 pin adapter, a 13 pin adapter, 7 LED indicators [Widely Use] Made to normal European standard, fit for bicycle, car, caravan, carrier, RV, van or any other commercial vehicles [Main Materials] Made of copper and ABS plastic, sturdy and handy gadget [Package Included] 1 x Trailer Plug Socket Tester, 1 x 7 Pin Connector, 1 x 13 Pin Connector, 1 x 9V Battery (optional)