The plug adapter is always supplied as Amazon products without much Plasikmüll as packaging. The device itself can be explained at the beginning, unfortunately, not by itself. It is indeed a gray switch of the possibility of angling fixed in different grid positions available, but what I did with the rotary ring first mystery. By turn did not change much and when inserting into the outlet of my car wiggled everything and had only now and then-current contact, which can be seen on the red LED. I due to the design of my vehicle had to adjust the angle is very steep, so even two plugs have to be inserted, such leverage is revealed that no current flowed. Plugging and unplugging and fumble at the wheel brought little until I came up with the idea to insert the plug and then rotating until the wheel. While this was tremendously tricky, but so tensed suddenly the plug in the socket seems that now everything works fine. A star deduction is now unfortunately yet, since the plastic of the plug consists of windy material and acts to rotate after repeated contact and eventually something breaks.