Transcutaneous electrical nerve stimulation, or TENS, is a technique that makes use of electrical current in an attempt to stimulate the nerves to help deal with pain.
The TENS units are small devices that operate off a battery and that deliver the electricity to the body via pads that attract to the skin. They generally have between two and four electrodes.
The portable units for sale to consumers today are high quality, and they have the ability to modulate the frequency, intensity, and pulse width.