The painmaster MicroCurrent Therapy Patch has been recommended by a trusted Physio and we have had some good results for some patients in constant pain. NO STRONG DRUGS,NO CONSTIPATION, NO DROWSINESS We have had people with back problems and Knee pain show good results after using painmaster patches. Finally out of pain. Ask in our pharmacy for free advice and a leaflet. The microcurrent device delivers a current that is too low to be felt, however the relief from pain is noticeable after a few hours or a few days of regular use. This unit has many months use providing around 300 hours continuos use for most people then needs to be replaced.