This electrical converter allows to change a US style 4-way flat plug to a European style 13-pin connector Plug and play design, minimize the hassle of installing any wiring inside, no other adapters needed Included a dust cover in the EURO trailer 13-pin plug side to keep your plug clean when not in use Converter with the function of separating "stop" signal from the two-wire system US vehicles Wiring US 4-way vehicle connector to trailer with European 13-way trailer wiring Instruction: 1. This fantastic Trailer Light Converter made is designed for separating "stop" signal from the Two-Wire System US Vehicle to connect your European Trailer (caravan, boat trailer, bike carriers and others). It provides a electrial solution that if you have a US vehicle with 4 way flat, and you want to hooks up a European trailer, with a 13-way Round Pin. 2. If your US vehicle has the 4-Pole flat connector, and your European trailer has the 13 pin round plug, where your US car need to separate the stop and tail signals, this Trailer Wiring Adapter need to be use. Installation Guide: a) Before connecting the Converter to the vehicle, check that all signals on the car have been turned off. b) Connect the Converter to the existing US 4 way connector in the vehicle. c) Insert the other side EU trailer plug into the socket Converter. d) Check that all connections are safety fastened. e) When exploitation, maintenance of the electrical adapter is not required. color:Black Material:polyester Package Contents: 2 x Trailer light converter Only the above package content, other products are not included. Note: Light reflection 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.