Usually on the back of the unit next to the power plug-in there is a small symbol that looks like this -(o+ the circle represents the center pole if the plus sign is beside it then the center pole is positive sometimes the voltage is listed there also if not then look on the label on the bottom and the voltage and amp rating will be found there
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Usually on the back of the unit next to the power plug-in there is a small symbol that looks like this -(o+ the circle represents the center pole if the plus sign is beside it then the center pole is positive sometimes the voltage is listed there also if not then look on the label on the bottom and the voltage and amp rating will be found there