Cefaly works using an electrode that is applied to the forehead. Each electrode can be used up to 20 times (a dozen times for Blue Gel electrodes).
It is extremely important to cleanse and degrease the skin on the forehead so the electrode will effectively stick to the skin. The skin should be cleansed with soap and water. After use, the electrode should be placed back on its clear plastic backing strip and then stored in its pouch to prevent it from drying out.
The electrodes can be purchased in sets of 3 for $25.00 per set ($33 for Blue Gel electrodes).