Makes your appliances work all over the world! Changes 220/240V Foreign Electricity To 110/120V U.S. Electricity. Also changes 110/120V U.S. Electricity to 220/240V Foreign Electricity

HOW TO USE:Make sure your input voltage matches your country's electricty voltage. SELECT THE CORRECT INPUT VOLTAGE. Plug the AC power cord into the wall outlet, then push the ON/OFF switch to the ON position. Turn off when not in use.
CAUTION: Before connecting your appliance and the transformer, make sure the voltage of your appliance and the transformer are matching with the electricity voltage of the country you are in.
WRONG SELECTION MAY DAMAGE YOUR EQUIPMENT:
a) At 110V country, if selected 220V at switch, the output voltage will be reduced to half of rated voltage.
b) At 220V country, if selected 110V switch, the output voltage will be 2 times of rated voltage. High humming sound may be heard or vibration may occur.
DISCONNECT IT RIGHT AWAY from the wall outlet