Key Features Step-up and Step-down: This voltage conversion transformer can step up the voltage from 110V to 220V or step down from 220V to 110V in a variety of ways for you to choose.   Convenient to Use: Switching power can start the device at once, reducing the standby loss and extending the service life. And this voltage conversion transformer contains the power plug, plug and play, convenient and fast.   Overload Protection: When using too much high-power equipment and exceeds the load capacity of the distribution line, the transformer will automatically stop working to prevent safety hazards.   Heat Dissipation Performance: It is equipped with a large diameter bilateral fence type heat sink so that the transformer has a good heat dissipation effect and makes the machine more stable in operation.   Four Conversion Jacks: It has a multi-country jack, two US standard sockets for 110-120V devices, and two universal sockets to accept all types of plugs except the large South African plug for 220-240V devices, such as US, EU, UK, and Japan. You don't have to worry that your appliances will not fit into this transformer.   Application This transformer can be used for both home and commercial applications. It is suitable for many types of household appliances.   How to Use To convert 110 volts to 220 volts: 1. Make sure the appliance to be plugged in uses fewer watts than the transformer's rating. 2. Insert the voltage tap plug (located on the rear of the transformer) into the pair of holes marked "110". 3. Plug the transformer's power cord into a source of 110 volts. 4. 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: 1. Make sure the appliance to be plugged in uses fewer watts than the transformer's rating(80%). 2. 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.   Specification Model No.: DT-1000VA Shell Material: Iron Protection Mode: Overload Protector Rated Capacity: 1KVA Rated Power: 800W Output Voltage: 110V 220V Product Size: 15.3*23*19.3cm/ 6.02*9.06*7.6in   Package Included 1* Transformer 1* Power Cord 1* English Instruction Manual   Notes 1.To prevent damage and possible fire hazards, the fuse should be replaced with a slow fuse (MDL) of the same amperage rating as the original fuse. If the fuse continues to blow, the transformer and/or the appliances connected to it may require service. 2.Please do not connect appliances that exceed the maximum power rating of the transformer to it.