This modern, Japanese product stimulates the acupoint with a mild surge of electricity (high voltage, low current) with a mono-phasic spike wave form.. Uses no batteries or power supply, the unit is self-powered, portable and durable. Simply press the button on top until it "clicks", and the point is stimulated. Good for 5,000-10,000 stimulations, output is not adjustable. For investigational use only, not for sale outside the U.S.