I have the numeric keypad simply plugged in to my Mac Book and that's it. After that I was finally able again blindly enter numbers (like the old days with the full key board the big computer). :-) The keys feel a little lightweight, but that's just a subjective feeling. This part is working properly. Excellent automatic Kabelaufwickung. Also it works flawlessly. Simply plug from the capsule draw and you have the desired length. Pull again and it is rolled back. So you can pack away the whole very pleasant and nothing can get tangled. Schön, the designers have done so useful thoughts at such a cheap part.