An electro-therapy device that generates a mixed electrical signal through electrodes, wherein the mixed electrical signal is a combination of at least two different frequencies, a first frequency having a first minimum and maximum microamp range and a second frequency having a different second minimum and maximum microamp range. The higher of the two frequencies is superimposed on the lower frequency, creating a current intensity window as an envelope along a profile of the lower frequency. The mixed electrical signal is automatically applied for a pre-determined period of time, and amplitude and/or duration and/or frequencies is varied according to a pre-set schedule.
