This adapter is used, devices without without protective conductor, so instead, with the flat Euro plug (also plug type C or CEE called 7/16), to sockets of type A (also called NEMA 1; without earthing contact) or Type B ( also called NEMA 5; to connect with shockproof). One possible application would demach to operate an acquired unit in Germany without earthing contact at a US outlet. Devices with earthed (also single phase, plug-type F or CEE called 7/4) do not match. Other compatible plug or use countries such as can be found in the Wikipedia under "plug".
Plus points: + All connectors are properly connected (by measuring with multimeter) + Solid build (it wobbles nothing) + Incl. Cap + Low
