Analog Interferential DeviceAnalog Inferential Device Helps to control pain and speeds the healing process by delivering small pulses of electrical current to an injury through electrodes. The electrodes pass current through the skin and stimulate underlying nerves producing a mild, tingling sensation to provide relief from chronic and acute pain. Comes complete with AC adaptor, lead wires, four self adhesive reusable electrodes, 9 volt battery, carrying case and manual.