I bought them and a couple of USB adapters (https://www.amazon.com/gp/product/B07GVCJCCW/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc= 1) for my wife and I on a 2 week trip to Italy. We've just got back and I'm happy to report that the combination worked great! We've stayed in two different places and used them a few times on the train. It is important to confirm that the USB adapter works on 220V in Europe and does not work on 120V in the US. I expect the majority, but this is crucial.
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