I quite often travel with an international adapter. It looks like the picture- I like the brand but it's not an endorsement as loads of companies make these. The adapter gives us extra capacity since ships usually have both type B (US) and type C (European) outlets- but only use this if you have electronics with the transformer embedded to make them automatically dual voltage (phones, laptops, etc do). An added benefit is if you're flying to and from the port- some older planes only have standard outlets instead of USB, a lot of times the US outlet is worn so the plug is too loose, but the European part is just fine. https://m.media-amazon.com/images/I/51YYv5c95CL._AC_SL1500_.jpg