UNIQUE DESIGN: Designed according to the trailer adapted in 13 pins of European standard vehicles: Establish the stable and secure link between a main vehicle and towed vehicle, and transmits the electrical signal from the lamp to the trailer SINGLE USE: Suitable for most modern vehicles equipped with the 13-pin socket at the input, Attaches very easily to a 13-pin car socket to connect a 7-pin trailer socket at the output and is also easily dismantled after use CUTE AND PRACTICE: The adapter is very small in cute size but very handy, sturdy enough so it doesn't bother at all if left on the vehicle all the time, easily clamps onto the 13 pin socket with a 1/4 turn like all caravan sockets USE AND DETAIL: After pushing the adapter halfway into the socket, it must be rotated 90 (1/4 turn to the right) clockwise, this finishes fitting it in and secures it. Finally the cap of the female socket on my car fits perfectly on the adapter, preventing it from rotating, there it does not move at all, for the protected design, we have the cover with a spring hinge protects the contacts of the plug to 7 connected SIZE AND ATTENTION: Size of 8*8*4.7cm, before you make the order , please check your car socket ,if you have any question ,send the message for the first time please Note: The data is all manually measured, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, the actual object received shall prevail.