The new ergonomically designed device has the same parameters as its predecessor; adjustable pulse rate and pulse width, and has three modes of operation; constant, width modulation, and burst. The new design of the device incorporates a sliding amplitude control cover for safety, and a permanently attached 9 volt battery cover to prevent loss. The 9 volt battery compartment has been redesigned for simple insertion and removal of the battery. To provide comfort while wearing, the belt clip has been positioned horizontally. The device was designed to be easy to use and economically priced for the patient. Includes Lead Wires 4 Electrodes Batteries Carrying Case 1 Instruction Booklet Specifications Size 3.9 x 2.75 x 1 Weight 4.6 oz Power Source 9V Battery, E-block, type 6F22 Channels Dual Waveform Asymmetrical, biphasic square-wave Frequency 2-150 Hertz Impulse Width 50-250 microseconds Output Constant current Burst 8 pulses per burst/2 bursts per second Modulation Decrease/increase of set width of 50% over a five-second period Number of Electrodes/Leadwires 4 Tolerances /-10% Warranty 3 years 1 Each / Each