For travelers from more than 150 countries to the world. Also a detachable and inter-operable dual USB top provides a powerful USB charger connection. A worldwide adaptor is two different adaptors. These adaptors can also work separately or together. World to Europe adaptor, Europe to World adaptor. Attention: the adaptor does not convert voltage. For devices with 2- and 3- pole plugs in protection classes I and II, including hairdryers and laptop.