Main Function: This product is designed for use with electrical appliances in regions with AC 220/240V or AC 110/120V voltage systems. It allows appliances rated for 110V to be used in 220/240V areas and appliances rated for 220/240V to be used in 110/120V areas, provided the appliance's wattage does not exceed the transformer's maximum power rating. Do not exceed the rated wattage; failure to observe this may result in damage or fire hazard, and no warranty will be provided if the transformer is damaged due to overloading. To convert 110V to 220V: Ensure the connected appliance uses fewer watts than the transformer's rated capacity. Insert the voltage tap plug (located on the rear) into the holes marked "110". Connect the transformer's power cord to a 110V power source. When the power switch is turned on, 220V will be available at the front panel outlet marked "220". To convert 220V to 110V: Ensure the connected appliance uses fewer watts than the transformer's rated capacity. Insert the voltage tap plug into the holes corresponding to the input voltage (200, 220, or 230V), confirming correct selection. Connect the transformer's power cord to a 200–230V power source. When the power switch is turned on, 110V will be available at the front panel outlet marked "110". Note: If the fuse blows, replace it only with a slow-blow fuse (MDL) of the same amperage rating. If the fuse continues to blow, the transformer or connected appliance may require inspection or repair. Package Includes: 1 x Transformer