Transcutaneous electrical nerve stimulation, TENS, is a type of electrotherapy pain relief system that uses a small current through the skin to induce analgesia and provide pain relief without the need for drugs. The Quell wearable relief technology unit is a type of TENS. You just insert the battery unit in the sleeve, strap it around your calf, and let the electrodes provide continuous prescription-strength electrical stimulation throughout the day.

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