Specifications: Input Voltage: AC 110V or 220V Output Voltage: 110-120V or 220 V-240V Operating Instruction: Step Up and Down Transformer unit should be placed in a well ventilated area at all times. Step Up and Down Transformer have an input voltage selector located at the back of the unit wherein the user can select either 110-120V or 220 V-240Vdepending on the available rated voltage source. For appliances with inductive load, such as refrigerators, mini are condition, industrial fan, etc. It is recommended to use a transformer that has rated power capacity of 3 to 5 times of the load power because the start up current of these appliances are vary high. For capacitive load, just leave enough allowance on the rated power capacity of the unit to avert overloading. Check your appliances for the rated power consumptions to avert overloading the unit. Make sure that appliances are switch OFF before turning on the STEP UP and DOWN Transformer unit.