It seems that the effectiveness of creating some form of binaural beat technology was discovered on a practical level long before modern technology. The traditional Tibetan “Tingsha” cymbals or bells were slightly off pitch of one other to create form of sound wave prominent only when both bells sounded. These are commonly used in various meditation retreats announce the beginning of a meditative practice or to create a sacred space with sound.
As with many of these technologies, test the bells first to make sure they provide a relaxing and positive experience for you as an individual. They are a highly portable means of producing a clear sound that many find conducive to meditative practice.
Tibetan bowls also produce unique sound frequencies which may aid in reaching a deeply relaxed state. Some of these come in sets with tones specific to particular energies of the body.