Allows you to use 100-120 volts equipment in a 220-240 volt country. This item will allow you to use 110 volts appliances in Europe, Asia, Middle East and all other 220-240 volt countries. This item is to be used on products from 0-50 watts and on heating products from 0-1600 watts such as a curling iron, hair dryer, or iron. Please remember that the 1600 watts does not mean you can use it on any 1600 watts appliance. It is only for small appliances that heat up.