Use any 220V appliance in the US. If you have any device that works with 220V now you can use it in the US just adding this great adapter. This adapter will transform the 110V obtained from any wall plug in the US to 220V, so you can use your appliances from another countries that were made to work with 220V. Converts 110V US electricity to 220V foreign electricity. Allows 220V foreign made portable appliances to be used in 110V US outlets.