The Alpha-Trainer / Antense® anti-tension biofeedback device is a simple yet effective way to eliminate stress by helping you develop a greater sense of body awareness while in the comfort of your own home. Optimal for personal health and fitness. Using the scientifically proven principles of biofeedback, Alpha-Trainer / Antense® makes you aware of how stress changes your body and how to better control these changes. Your body indicates its stress level by muscle contractions in the forehead, neck and scalp. Using space age patented technology, Alpha-Trainer / Antense® measures these contractions and instantly converts the signal into a pleasant tone-pitch proportional to the level of muscle tension in your body. By listening in on the tension in your body you can control the pitch using the tone as a guide. By learning to feel how stress changes your body, you will quickly understand how to release that tension and stress and learn how to relax at will. Enables increased alpha and theta activity with use. This comfortable leatherette headset has an adjustable soft belt with dry EMG electrodes, a sensitivity control and adjustable volume. (requires a standard 9 volt battery)