Description: Maximum power capacity：5000w Dimensions：25cm*40cm*21.5cm/9.84in*15.75in*8.46in G.W：13.5kg To convert 110 volts to 220 volts: ----Make sure the appliance to be plugged in uses fewer watts than the transformer's rating. ----Insert the voltage tap plug (located on the rear of the transformer) into the pair of holes marked "110". ----Plug the transformer's power cord into a source of 110 volts. ----220 volts will be available at the front panel outlet marked "220" volts when the power switch is turned on. To convert 220 volts to 110 volts: ----Make sure the appliance to be plugged in uses fewer watts than the transformer's rating. ----Insert the voltage tap plug (located on the rear of the transformer) into the pair of holes corresponding to the local voltage standard .