Compex Easy Snap Performance Electrodes are used during muscle stimulation, and are compatible with all Compex snap-on cable devices. Electrodes are the points where the pulses are transmitted to your motor nerves, and ultimately your muscle fibers. They play a big part in the Compex muscle stimulation session, allowing you to work your muscle at peak effectiveness. Each Compex Easy Snap Performance Electrode is coated with a strong medical-grade adhesive, developed to stick to your skin. When used in normal circumstances, each electrode should last 15 to 20 sessions.