I am an American Citizen living in Brazil. All of my work laptops, iPad, iPhone, etc use the USA outlet. This device is important because it’s bi-volt. SOME STATES IN BRAZIL USE 220V WHILE OTHERS USE 110 FOR THE SAME OUTLET. This device automatically converts so that you do not fry your devices. The older system uses 2 prongs (also included) but the two prong adapter will still fit in a 3 prong outlet. Most modern buildings use 3 prongs, but the voltage varies depending in which city you are in. This device is compatible with all of the above. I bought two of them. One powers my laptop, second monitor, charges my iPhone, and powers my iPad because of the USB/USB-C connections.