A:Answer The voltage is 230V in Europe and it is only 220V in a few countries like the Philippines, China, Chile, etc.
To answer your question though the included charger shows that it supports input voltages from 100-240V and both 50Hz and 60Hz. So it should work wherever you bring it, but make sure you have the proper plug adapter.
As long as you have charged up the batteries it can be used anywhere, since it is wireless. Hopefully that answers your question.