110 to 220 Volt

All Mac minis have had a universal global power supplies. What Neil is referring to is the fact that models from 2010 onwards i.e. the aluminium 'unibody' versions which have a built-in internal power supply merely need the power cable changing.

The older models with an external white power supply 'brick' also only need the cable changing.

You can of course simply use a travel plug adapter, it is not necessary to get a power transformer from 110v to 220v.

Yes, if it's a mid-2010 or newer model.

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Just use a plug adapter. Note that the power requirements are printed right on the Mac.