Transcutaneous electrical nerve stimulator (TENS)

A transcutaneous electrical nerve stimulator, more commonly referred to as a TENS unit, is an electronic device that produces electrical signals used to stimulate nerves through unbroken skin. The unit is usually connected to the outer surface of the skin using two or more electrodes. A typical battery-operated TENS unit consists of a pulse generator, small transformer, frequency and intensity controls, and a number of electrodes.

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