This Audible IC is to demonstrate what binaural beats sound like. For this, you will need to use headphones. To begin, you will hear the same frequency in both ears. Then, the frequency in the Left ear will be reduced, while the frequency in the Right ear will remain the same. You will start hearing beats. The frequency of those beats will be equal to the difference between the two frequencies. For example, if the frequency in the Left ear is 90 Hz and the frequency in the Right ear is 100 Hz, then you will hear beats with a frequency of 10 Hz.