Hello, We live in USA and will be traveling to Italy and Greece next month for the first time. We will be taking our laptops and cell phones with us. Although I'm sure we will need an adapter plug to connect our power cord to the European wall outlet, will we need a power converter/transformer also? I know that USA voltage is 110-120V and European voltage is 220-240V. But I'm unsure whether most modern laptops and cell phones are "dual voltage" or will automatically adjust the voltage accordingly. Or is it device-specific?