not to have mandatory but very nice

If you use well-charged batteries, the device works perfectly and is a joy to use. I reach now like again to tried and true pencil or crayon for writing and marking because sharpened it is fast and easy, without that constantly break the mines. He even beats case pencils oa variants.

I myself was very skeptical buying can but now good conscience! Particular concerns I had, if my (small) children probably can put their fingers into the sharpening hole would. This seems to me very well secured and very unlikely.

How long will the batteries, I can not say yet.

The only drawback: The tip is for my taste a little too long, a slightly steeper pointed cone (not adjustable!) Would be desirable.