This is an apparently well-made adapter and USB power supply combined. It is not tiny, but it should be able to fit most power outlets around the world as well as accepting most plugs. Since it also provides 4 USB power outlets, it is probably a lot more compact than carrying multiple adapters and chargers. Note that it is not grounded: for power outlets that require a ground (earth) prong, such as those in Britain, it provides a dummy plastic prong. So don't use it for something that requires a ground, such as some hair dryers.