What is a binaural beat? Binaural beats are simply brain waves that are created by sound waves. Headphones are required for this to actually work. In one ear a frequency is played and in the other a slightly different frequency is played. The brain then takes the differences between the two frequencies and creates its own frequency. Example: 100Hz is played in one ear and 117Hz is played in the other. A binaural beat of 17Hz is created by the brain in which the natural brain waves start to follow the binaural beat that was created. http://www.monroeinstitute.org/resources/what-are-binaural-beats