HeadaTerm is based on none-invasive external Trigeminal Nerve Stimulation (eTNS) technology that introduces precise electric impulses from the user’s forehead to act on the supratrochlear nerves. According to nerve gating mechanism, the brain will receive the higher rank nerve signal when two or more nerve signal arrived. The grade of supratrochlear nerve is higher than the grade of trigeminal nerve whose pain is the main reason of migraine. As a result, the brain can’t receive migraine signals when supratrochlear nerve is stimulated by continuously electric impulses. At the same time, the electrical impulses generated by HeadaTerm can also activate the opioid receptors to release natural opiates and decrease the migraine sensation.