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[[File:Quell-componentsprinciple.jpgjpeg|thumbnail|A) A therapy pod, B) An electrode array, C) A Band, D) An example Picture from official webpage depicturing the process of usage on upper calf, place of effecthow pain is blocked in medulla<ref>Shai N. GozaniIntroducing Quell, Science Behind Quell™ Wearable Pain Relief Technology for Treatment of Chronic Paina 100% drug free technology proven to fight pain: https://www.quellrelief.com/files/science-behind-quellQuell%20HCP%201%20page%20(3).pdf</ref>.]]