Brazil is one of a few countries that uses both 120 and 240 volts for everyday appliances. Expect the voltage to change back and forth as you travel from one place to the next, sometimes even within the same building. There is no physical difference in the electric outlets for the two voltages.
Should I bring it
There are some items which you should feel free to bring, like cameras and camcorders. However, we recommend you limit your electronics to a bare minimum for several reasons. First of all, they can be lost or stolen. Secondly, since this is a pilgrimage, you should leave as much of your life behind in order to be able to experience what God has in store for you.
Most electronics can handle 100V to 240V of current, making a converter unnecessary. (Look at the fine print on your electronics for voltage details.) It is recommended that you bring a power adapter which can change your plug to flat blades, round pins, or both.
A general rule of thumb is, don’t bring it. If your electrical things cannot handle the 240V current, don’t bring them… hair dryers and the like.