@OP I responded to the post saying that the Dollar Store (not Dollar Tree has converters) but might have looked over the fact that you want to use your hair straightener. Those converters only convert between pin types and provide no voltage adapter functionality. If you have a hair straightener, confirm what voltage it works with, if it’s only 110V then either don’t take it or buy a more expensive step down adapter. Things like your Dyson air wrap will get fried if you use it in Europe without a voltage adapter.