This is a plug for car standard cigarette lighter. Some cars, like certain models of VW and SKODA, have a constant power at the lighter. So it is nice to plug it to avoid a shock or a blown fuse.
Other cars it is still useful to plug it as dust and hair gets into the lighter hole - and then blown fuse or malfunction, happened to me also.
Anyway, plug it and use it at your risk assesment only. This is not an original part for your car.
cig_plug_STL.stl | 378.1KB |