I thing it is about the cord vs the plug. The plugs are as they are in the picture, but most cords are in F+E configuration. That is, there is the ground plates on the side of the cord (F) and there is a hole in the cord with a springplate to connect to the ground thingy in thr plug (E). I have two extension cords at home of the same brand, one in E and one in F configuration, but all my cords are compatible with both. I'm a bit unsure on this, but I may have seen a plug with E+F configuration in a country which usually goes E, but definetly never in a country with F config.