Trailer Connector Electrical Circuit Adapter, 6-Round to 4-Flat

6 round to 4 flat, electrical circuit adapter, use in towing trailers when the vehicle & trailer have different electrical connections, if vehicle has a 6 way round connector & your trailer has a 4 way flat style connector used for the trailer lights, insert this product into the vehicle 6 way round connector & plug the 4 flat trailer connector into it to operate the lights, use only on 12v dc vehicle circuits.