This plug adapter is for American electronics devices that have 2 flat parallel prongs and converts them to the European style with 2 round prongs. - Most electronic devices have a 110v-220v transformer or dual voltage (110/220 VAC) for worldwide use. If your devices have it, all you have to do is simply plug this adapter and you can use it in Europe. Note : This adapter does NOT CONVERT the Voltage. This is NOT A TRANSFORMER!!