Control your inner states in just five-to-ten minutes a day! Thought Stream's advanced technology utilizes a digital signal, as well as tonal signals, to measure shifts in your emotional state. You'll get the perspective needed to recognize states of stress and relaxation more easily and be able to take control of negative thoughts influencing emotions while "zapping" psychological stress. It's easy! Just put on the finger probes and turn the unit on for an LED- displayed playback. Earphones allow dual monitoring. Relaxation tape and user-guide included.