Isochronic Tones

Isochronic tones are very effective in inducing entrainment.

Isochronic tones differ from binaural beats in that the entrainment  is simply a tone that turns on and off at a rate determined by the state that is to be induced.

Because of this you do not need to use headphones when listening, but you do need to listen in stereo.

If you can't use stereo without headphones then you must use stereo headphones.