How To Best Use Your TENS Unit? I am having pain in my back, but I don’t want to take any medicines what I should do? - A Patient Is there any device that I can carry on travel for pain relief? - Another Patient The answer to both the questions above is TENS. It is an abbreviation for Transcutaneous Electrical Nerve Stimulation. In simple terms, a TENS unit stimulates your nerves via an electrical current through your skin. In the majority of cases, the TENS unit is powered by a 9volt battery that produces pain relieving electrical signals. They may be available in either two channel or four self-adhesive channel electrodes that are applied to the TENS unit with leads wires. The modified electrical pulses are then passed from the TENS unit with the help of lead wires and electrodes. TENS is a non-invasive therapy to assist with pain relief. With the regular usage of TENS machine, you can reduce pain for up-to four years. You must bear this in mind that TENS is considered as a pain-relief tool that is not curative. With prolonged use, the degree of pain relief declines.