The safety shutter is the unique function of double on-and-off. The female socket accepts many different plugs and fits in any bag. Algeria, American Samoa, Aruba, Austria, Azores, Balearic Islands, Bosnia, Bulgaria, Cape Verde, Chad, Croatia, El Salvador, Finland, France, Germany, Greece, Guinea, Hungary, Iceland, Indonesia, Italy, Jordan, Korea, Laos, Luxembourg, Madeira, Monaco, Mozambique, Myanmar, Netherlands, Neth. Antilles, Niger, Norway, Portugal, Romania, Spain, Suriname, Sweden, Turkey, Uruguay, Yugoslavia (former). This is a great Universal plug when traveling Europe!