What are you searching for? A midi keyboard or arranger?
For 120€ you are not gonna find something good... I suspect you are talking about a midi keyboard? You can find a Novation or Komplete Kontrol midi keyboard for 200€.
If you are talking about a arranger keyboard and want good sounds, you will need to add double to that amount to at least find something nice: look for casio, they are cheap keyboards and they produce nice sound, still gonna need to pay more then 120€ though...
I bought, out of curiousity a Startone on Thomann once, the most expensive one, but I returned it. It was around 170€ but it was the most expensive one from them. For a beginner it might be a nice one.
Wireless? I do not understand how that works... you always need to connect it to my knowledge with a audio jack to an audio interface. So thats another cost you need to do. I aint sure to be honest if you are talking about a musical keyboard or a computer keyboard to type stuff with...