PAT is an electrical stimulator device sold over-the-counter without a prescription, is battery powered and is totally portable. Special electrodes deliver the current to the body part that is causing the pain. It uses extremely low direct current (microcurrent). The treatment works to relieve pain in two ways. First, it reestablishes your natural healing current flow to the affected area. Second, the cascade effects of microcurrent relieve the pain directly, and most importantly, reduce the underlying inflammation that may be causing the pain.