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The positive or red end sends a pulse of electricity to the negitive or black end.
I use this tape so I can re-use the same pads for a year.TENS should not be used by people with an artificial cardiac pacemaker due to risk of interference and failure of their implanted device.Possible failure of these warnings can result in a cardiac arrhythmia.BSDM armpit fun: Black end on one armpit, right end on other.Simulated foreverspank: Black end on the top left side of your bum, red end on top right side.
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To understand optimal placement I highly encourage Doms to try out the TENS unit on themself before they use it on their Sub.