This electrical converter is used to exchange a 4-pin vehicle plug for a 7-pin European plug. A dust cover is included on the side of the 7 pin Euro trailer to keep the plug clean when not in use. 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 guide: a) connecting the inverter to the vehicle, check that All vehicle signals are turned off. B) Connect 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 that all connections are . e) No maintenance of the power adapter is required during use. 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 cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.