If this adapter is international (works in England) I draw your attention to two points: - There is no land - The USB power is not well regulated and disrupts smartphones (eg impossible to use the android HTC Touch on when powered by the USB charger adapter !!!
Finally after 3 weeks I heard a snap and the adapter was not working at all. The USB power slammed without any reason, but the fuse is still good.
My recommendation is to avoid as much as possible this kind of adapter to prefer a simple plug converter.