The invention relates to a device for detecting the weight of the useful load of a commercial vehicle, comprising sensors which detect the amount of vehicle load produced by said useful load, in addition to a data memory that records information detected by said sensors. According to one embodiment, the printing system includes a print head that is laterally displaced from a radial printing radius, a rotating mechanism to rotate the media, and a controller to print onto an annular print area. When the hair dryer is disconnected from the attachment, the hair dryer consumes less power than the predetermined amount of power.