The Digital Electronic Muscle Stimulator With Timer is a proven, efficient way of treating muscle injuries by the transmission of electronic pulses that causes passive exercise. The stimulation, contraction and relaxation cycle of EMS loosens muscle fibers, increases blood flow and stimulates muscle growth. Comes complete with carrying case, 2 lead wires, 9-volt battery, 1 package of 4 pre-gelled electrodes and operating manual. Digital wave technology provides a highly efficient delivery of the wave signal. Dual isolated channels. Pulse frequency adjustable from 1-150 Hz. Pulse width is adjustable from 30-260 micro-seconds. Contraction time is adjustable from 2-30 seconds. Relaxation time is adjustable from 1-30 seconds. Ramp time is adjustable from 1-6 seconds. Metal belt clip. Intensity control is adjustable to 80 mA, 500 ohm load. 3 Year Limited Warranty.