If you intend to use your hair dryer in Europe you will have 2 things to take into consideration. Firstly, you will need a travel adapter that changes your U.S. plug into one that will work in sockets in the European countries you are visiting. Secondly, U.S. appliances run on 110-120 volts and Europe runs on 220-240 volts. You will either need a converter or check to see if your hair dryer is dual voltage.