For chronic, acute and post operative pain Designed for rehabilitation and physical therapy Dual isolated channels Mode Selector: Constant Intensity control is adjustable from 0-80 mA, 500 load Pulse frequency adjustable from 2-150 Hz Pulse width is adjustable from 40-250 micro-seconds Wave form: asymmetrical, bi-phase, square pulse Plastic belt clip Comes complete with carrying case, 2 lead wires, 9-volt battery, 1 package of 4 pre-gelled electrodes and operating manual