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 new 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