I just got two of these here on my table:
The price was very nice: € 13,90 per plug.
I read here, that it was possible to integrate these into FHEM via CUL - and I asked myself if someone else did it already for openHAB. They’re working in the range 433,05 - 434,75 Mhz
If nobody did this before, I’ll try my luck - but maybe I need support from people having experience with CUL.