Description Compact sized plug-in power supply allowing 120Vac electrical equipment (USA type) to be powered from a 240Vac mains outlet. This handheld voltage converter is designed for use by those who are using 100-120V Appliances in countries which provides a 220-240V mains voltage. (e.g. When using appliances bought in United States in Europe). This unit can be used for appliances with power of up to 45W. Instruction: 1.)Please insert the voltage converter into mains outlet with 220-240V. Insert the input plug of the appliance (which needs an input of 100-120V) into the output socket of the voltage converter. 2.)After use please turn off the appliance before disengaging the appliance from the socket. Warning: Uses on appliances of more than 45W will blow the unit and could cause significant problems. Please check the power label of your appliance to see the required wattage. Wattage can also be calculated by multiplying Volts x Amps. 110V @ 1A is 110W 110V @ 0.4A is approx 45W For indoor use only.