Pronto RU990 is now landed in my house.
I desided to get an Europen version at last.

Here is the official answer from Philips: Can i use TSU in Europe or RU in US
No you can not.
Due to legal regulations RF devices can not be used in different regions. TSU7000 is FCC approved, but not CE approved. The latter is needed for Europe. RU980 is CE approved, but not FCC approved. The latter is need for the US.

At my opinion there are no other reason for that it should not work either way.
It can learn :)