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ELECTRICITY: Electricity in Rio, Manaus, Iguassu and Salvador is varies from 110 to 127 volts, although at some hotels 220 volts currency is also available, so check with the front desk before plugging in. Although plugs may look different, no adaptors are normally needed for hair dryers, recorders, electric shavers, etc.
Outlets in Brazil generally accept 2 types of plug: Flat Blade plug and Two round pins:

Type(s) of plug

Type A

Type B

Type C

If your appliances plug has a different shape, you may need a plug adapter, which is cheap and easy to find.