Usually all electronics operate at 12V DC nominal voltage, some might at 3V or 5V though. All those transformers (whichever you get) do pretty much the same thing, convert the 110 - 240V AC into 12V DC.
Being 115-230 a spec range indicated on the transformer itself, it will be pretty fine for the European electrical networks given you have the appropriate plug. If not, you could get the appropriate plug, cut the provided one from the cable, and hook the cables to the EU plug.
This is an easy thing to do.