You're going to travel to United States and you don't know if your electric devices (your computer, mobile phone, battery charger...) will be able to work there?
To know if you need a travel plug adapter to go to United States, you have to consider 3 things : the shape of the plugs, the voltage and the frequency of the current delivered by electrical outlets in United States.
Here are the shape of the sockets in United States, and the the types of plugs used in United States :
If none of your usual plug is compatible, you should buy a universal travel adapter to be able to plug your electric devices (please visit our selection on Amazon for details).
Voltage : 120 V
Frequency : 60 Hz