Trailer extension adaptor is designed for connecting the lighting and electrics from your vehicle to the lighting board on your caravan or trailer. Trailer extension adaptor is suitable for connecting vehicles with twin electrics, which include 12N electrics that provide the legal lighting (brake, indicator & fog) and 12S electrics that provide supplementary electrics (reverse lights, interior lights, appliances). Trailer extension adaptor is Perfect for vehicles with twin electrics (12N/12S) Comes with attached lids on the 7-pin plugs. Also suitable for bike racks. Trailer extension adaptor is a high quality plug converter. Compact so didn' foul the bumper on the car. Fits well and is easily removed when not required after towing your caravan. This trailer extension adapter converts the 13-pin socket on your car to the 7-pin female socket. Plug this little adapter into the 13 pin plug and then plug in your standard 7 pin. This trailer conversion adapter lead is used to connect the lights from the vehicle to the trailer with ease. 13 pin plug to twin 7 pin N & S type socket easily plugs into your trailer socket. N & S plug to correct connection, and easy to get all your electrics up and running. Plug and play design, insert into socket, twist and lock, no need to change any cable. Used on newer cars with a 13 pin plug on the towbar. Insulated environmental PVC wires, waterproof performance. Make vehicle and caravan/trailer electrics compatible when towing. Supplies all road lighting (including reverse). Supplies ancillary charging circuits, fridge or other appliance supply on a caravan. color:Black Material:PVC+plastic Package Contents: 1 x Trailer plug 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.