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Quell is wearable device developed in purpose to provide palliative treatment for people suffering from chronical pain. Quell is commercially available, thus customers don't need any prescription from a doctor. In present, it is the only palliative wearable, which is approved by FDA to be used during sleep. Quell wearable is presented by two technological improvements, which is OptiTherapy™ electrode and transcutaneous electrical nerve stimulation (TENS), method allowing sending electrical pulses into afferent nerves through the skin. The technologie of TENS is not new, but it was developed on knowledge about possibility to heal with electricity, which was described already in 18th century.<ref name="johnson14">Johnson, Mark I., Transcutaneous Electrical Nerve Stimulation (TENS): Research to support clinical practice, Oxford University Press, 2014, p. 272</ref> Quell device was constructed in the beginning of 21th century, on the basis of knowledge about TENS.<ref>Science Behind Quell™ Wearable Pain Relief Technology for Treatment of Chronic Pain: https://www.quellrelief.com/files/science-behind-quell.pdf, (Retrieved Dec 15, 2015)</ref> its technology, marketing strategies and usefulness, regarding human enhancement and therapy.

* 1759 - John Wesley described medical usage of electricity for sciatica, headache, gout, and kidney stones treatment.<ref>Johnson, Mark I., Transcutaneous Electrical Nerve Stimulation (TENS): Research to support clinical practice, Oxford University Press, 2014, p. 272<name="johnson14"/ref>

* 1965 - Melzack and Wall proposed first conceptual model for mechanism which could lead to pain relief. They rationalized that harmful signals may be inhibited by peripheral afferents of large diameter.<ref>Johnson, Mark I., Transcutaneous Electrical Nerve Stimulation (TENS): Research to support clinical practice, Oxford University Press, 2014, p. 272<name="johnson14"/ref>

* 1970s - Developement of TENS (Transcutaneous electrical nerve stimulation).<ref>Johnson, Mark I., Transcutaneous Electrical Nerve Stimulation (TENS): Research to support clinical practice, Oxford University Press, 2014, p. 272<name="johnson14"/ref>

* 2007 - Johnson and Martinson - Largest meta-analysis of evidences about three times stronger pain relief than in placebo.<ref>Johnson, Mark I., Transcutaneous Electrical Nerve Stimulation (TENS): Research to support clinical practice, Oxford University Press, 2014, p. 272<name="johnson14"/ref>

Mark I. Johnson is author of a book supporting TENS technology.<ref>Johnson, Mark I., Transcutaneous Electrical Nerve Stimulation (TENS): Research to support clinical practice, Oxford University Press, 2014, p. 272<name="johnson14"/ref>