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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</ref> Quell device was constructed in the beginning of 21th century, on the basis of knowledge about TENS.<refname="science-behind-quell.pdf">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.
User have to buy accessories in addition like travel bag, spare cables, charger adapter, sports band<ref>Quell, Accessories, Online shop webpage: https://store.quellrelief.com/collections/accessories</ref>. And also two electrodes, user has to buy regularly, and which are currently available in two kinds of packages: one package of two electrodes for 29.95$, or three packages of two electrodes for 89.85$<ref>Quell, Electrodes, Online shop webpage: https://store.quellrelief.com/collections/electrodes</ref>.
[[File:Quell-components.jpg|thumbnail|A) A therapy pod, B) An electrode array, C) A Band, D) An example of usage on upper calf, place of effect<ref>Shai N. Gozani, Science Behind Quell™ Wearable Pain Relief Technology for Treatment of Chronic Pain: https://www.quellrelief.com/files/name="science-behind-quell.pdf<"/ref>]]
Regardless which part of body is in pain, Quell is always placed on upper calf (no matter which side). The reason is that there is better contact with nerves, on which are impulses sent to part of brainstem. After the devices is fastened around the calf, user needs only to press the button on it. The starter kit has inbuilt accelerometer which allows calibration of electrical intensity according to user's body, manually regulating is not needed.
=== TENS Research ===
There is only one paper about Quell principles right on the official Quell website,<ref>Science behind Quell, in: https://www.quellrelief.com/files/name="science-behind-quell.pdf, version 8/12/2015<"/ref> but this doesn't contain necessities of independent scientific study. Although there are no other studies dealing with Quell product specifically, an independent research about transcutaneous electric nervous stimulation (TENS) was conducted. This study appear not to be unambiguous regarding good efficacy of TENS in treatment. Here follow few works engaged in TENS technology and its influence on different deseases.
Sluka and Walsh<ref>Sluka KA, Walsh D., Transcutaneous electrical nerve stimulation: basic science mechanisms and clinical effectiveness, in: Journal of Pain, 2003, p. 109-121</ref> summarize existing researches of TENS, and shows couple of results of scientific trials, and speak about equivocal effectiveness remaining due to low number of randomized and controlled trials. Sluka and Walsh quote that different trials for one disease may have contrasting results, as in case with treating labor pain.<ref>Sluka KA, Walsh D., Transcutaneous electrical nerve stimulation: basic science mechanisms and clinical effectiveness, in: Journal of Pain, 2003, p. 109-121</ref>
