I am going to the UK, and I have a device that allows you to fit American electric plugs into European plugs, but I don't have a voltage converter. When I bought the outlet converter, I remember the guy in the store saying that some devices--specifically, hair dryers--need a voltage converter in addition to an outlet converter. Does anyone know if this is the case with hair straighteners as well? It seems like it would need less voltage than a dryer.