I probably wasn't clear. I wanted to know what type of plug the lamps use- in other words, when I buy a EU plug with USB outs will I need a US or EU pass-through. I ended buying this one from Amazon: Universal Travel Adapter, TESSAN International Plug Adapter, 5.6A 3 USB C 2 USB A Ports, Power Adaptor Travel Worldwide, All-in-one Travel Charger Outlet Converter for Europe UK EU AUS (Type C/G/A/I) that has both.