To convert 220 volts to 110 volts. Insert the voltage tap plug (located on the rear of the transformer) into the pair of holes corresponding to the local voltage standard. Check carefully to be sure no error has been made. The item "5000W Watt Step Up Down Electric Power Voltage Converter Transformer Heavy Duty" is in sale since Wednesday, January 1, 2020. This item is in the category "Home & Garden\Home Improvement\Electrical Supplies\Power Strips, Extension Cords & Adapters\Outlet Adapters & Converters".The seller is "masterurreg" and is located in Dayton. This item can be shipped to United States.