In the whole United States the voltage unlike that European (220V - 50hz.) it is 110V - 60 hzes. and besides the taking is type "flat pins " (you see figure). If the equipments that bring you in the United States they are type multitensione 100-240V it will be enough to purchase an adapter of thorn to be able to use her without problems. Practically all the mobil phones "triband" and the chargers of the television cameras are already predisposed for working to 110V.

If instead the equipments that you want to use in USA are alone predisposed for the use to 220V you have to purchase a transformer from 110 to 220, that provvederà to convert both the tension and the type of flat pins. You watch out for not to overcome the maximum load of the transformer (usually 50 W). Then no hair dryer, irons from I stretch and instruments to tall absorption. If you have really need of a hair dryer you can buy you him to little price on the place or to use only the adapter of thorn and to make to go to 110V yours... what will naturally go to half power!

Fairies pure a lot of attention to all the electric equipments that you purchase in USA, they must have predisposed for the operation with the voltage to 220V, or you is forced to the purchase of a transformer by 220 to 110 (the contrary one of the precedent). Naturally it always needs to watch out for the maximum load, always usually around the 50w.

can also happen (rarely) that the simple transformer 110/220 or 220/110 are not always enough to make to correctly work the equipment since it doesn't also compensate the difference between the 50 and the 60 hzes.

In conclusion you watch out for what you buy in USA not to find it to you unusable to your house