As a brazilian user, I have to live with those little problems myself.
If the unit don`t have an "auto-switching" power supply, buy a step transformer. 100 VA (=W) is enough. For the different mains frequency: just don't care for it! Switching power supplies works OK in the 48~66Hz range.
BTW: here we have two voltage ranges: 127V and 220V, both in 60Hz (sounds crazy to anyone?). :crazy:
