Metal belt clip. For chronic, acute and postoperative pain. Comes complete with carrying case, 2 lead wires, 9-volt battery, 1 package of 4 pre-gelled electrodes and operating manual. Designed for rehabilitation and physical therapy. 3 Year Limited Warranty. 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