The only downside is that Denmark uses two (2) types of plugs - the ones pictured here and another version with only 2 prongs. I think the 2-prong version is more "European", but I'm not sure. Anyway, these adapters worked great, but I only had one power outlet in my hotel room that accepted them.tldr: for trips to Denmark these work great, so buy them. Also buy the 2-prong European version.