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 .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 systemInstallation :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: BlackMaterial: plasticPackage contents:1x trailer light converterOnly 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. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.