The sharpener can also be operated with batteries, which suits me next to the power supply via USB. During the sharpening operation of the sharpener is rotated in the housing around the pencil / crayon. You have to watch something here that man pointed not too long, because otherwise a whole pencil in a very short time is completely weggespitzt. The LED street lighting g is a nice feature, but would otherwise have been not absolutely necessary. Two small criticisms there by my side, but not necessarily justify a point deduction, because the sharpening is just too much fun with this part: - The sharpener has no rubber pads under the case, what would be nice - There is no real receptacle for waste Spitz, but the entire transparent area is removed, which can cause a great deal can fall out.