This electrical converter is designed to adapt a 4-pin vehicle plug to a 7-pin European plug. A dust cover is included on the 7-pin Euro trailer side to keep the connection clean when not in use. The plug-and-play design helps reduce the need for additional wiring or adapters inside the vehicle. It allows connection of 4-way American flat connectors on trailers to European 7-way trailer wiring systems. The converter features the ability to separate the "stop" signal from American vehicles with a 2-wire system. Installation guide: a) Before connecting the converter to the vehicle, ensure all vehicle signals are turned off. b) Connect one side of the converter to the existing 4-way US flat connector on the vehicle. c) Insert the EU trailer plug into the other side of the converter. d) Verify that all connections are secure. e) No maintenance is required during use. Color: Black Material: Plastic Package contents: 1 x Trailer light converter Note: Lighting and display differences may cause slight variations in the color of the item shown in the picture compared to the actual product. Measurement may vary by +/- 1-3 cm.