Binaural beats are pulsing rhythms created by playing certain frequencies in separate ears. When paired with a matching visual beat in sync with the audio it makes an encompassing environment where one can focus on specific ranges of their brainwaves. Some have tried to sell this sort of thing as a "digital drug", but its not. It's really just a tool to help you deepen your awareness on your subconscious. If you would like to know more about the science, look it up: http://en.wikipedia.org/w iki/Binaural_beats
Have fun with this, try it with music if you would like. It's a good meditation tool. It works for the same reason strobe lights and fast music make a good experience. It's totally harmless just remember DONT USE THIS IF YOU HAVE EPILEPSY OR ANY OTHER PHOTOSENSITIVE CONDITION!!!