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 :)