Supposedly, the device helps you reduce your stress by helping you reach a state of “psychophysiological coherence.” In layman’s terms, happiness. From what I can tell, the emWave is basically like a personal de-stressing video game. You put your thumb on the sensor, or attach the ear sensor and then watch little lights go from red to blue to green depending on how “coherent” you are. By breathing in and out, you can supposedly reduce your amount of stress.
All for the low, low price of $199.