This electrical converter is used to exchange a 4-pin vehicle plug for a 7-pin European plug.TM8087B A dust cover is included on the side of the 7 pin Euro trailer to keep the plug clean when not in . The plug-and-play design minimizes the need for new cables inside without the need for additional adapters. Wiring of 4 way American flat connectors on trailers with European 7 way trailer wiring. Converter with the function of separating the "stop" signal from American vehicles with a 2-wire system Installation : a) Before connecting the inverter to the vehicle, check All vehicle signals are turned off. B) one side of the converter to the existing 4 way US flat connector vehicle. c) Insert the other EU trailer plug into the plug converter. d) Check all connections are secure. e) No maintenance of the adapter is required during . color: Black Material: plastic Package contents: 1x trailer light converter Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.