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 plug to keep it clean when not in use. The plug-and-play design minimizes the need for new cables without requiring additional adapters. It is used for wiring 4 way American flat connectors on trailers with European 7 way trailer wiring. The converter features a function for separating the stop signal from American vehicles with a 2-wire system. Installation guide: Before connecting the inverter to the vehicle, check that all vehicle signals are turned off. Connect one side of the converter to the existing 4 way US flat connector on the vehicle. Insert the other EU trailer plug into the plug converter. Check that all connections are secure. 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 is included. Other items are not included.