An Inverter converts direct current into alternating current. So it's useless for the OP going to Brazil. All he needs is the adapter plug mentioned above.
rjandreoff wrote:
You need an "good" inverter. I bought one on Amazon (read the reviews) and have used it successfully around the world for three years. No problems at all with phones, AA/AAA/Camera battery chargers, laptops, electric shavers. and laptops.