I bought them from kprepublic

It’s actually not that hard to use. It has around 7 layers of which you usually only use 3 or 4 when you are using ä, ö, ü. Only down side is you are restricted in typing speed since typing too fast can activate certain combos or change layers. You are basically stuck around 25-30 wpm (from my experience)

It’s an actual keyboard. I use it when I’m traveling

You are on to something!