The VITAL CARE MUSCLE MASSAGER has two outlets known as channels. Each channel has two wire connections with two pads attached at the end of each wire. The unit delivers a gentle electronic impulse to your muscles via the soft electrode pads that comes with your system. By placing the pair of pads on a particular muscle group, your muscles respond to the impulses that are generated by contracting and relaxing rhythmically as instructed by you through the unit. Just strap it on while you're resting, reading, net surfing or watching T.V. and watch your body transform right before your eyes.