The electric voltage in USA is in 110-120 Volts, 60 Hertz, and the electric output socket has two metal plugs. 

You should take an output socket suitable for USA for all your electronic appliances, and do not forget to verify that these appliances (laptops, digicam batteries, mobile phones, electronic shavers, hairdryers, etc) must be bi-tension.

Or prepare an adaptor/transformer before you part.