Description: Maximum power capacity:5000W Dimensions:33.5cm25cm22.5cm/13.19in9.84in8.86in G. ---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. ---Insert the voltage tap plug (located on the rear of the transformer) into the pair of holes corresponding to the local voltage standard.