All of our products have been scientifically generated for absolute accuracy of each frequency.They are extensively tested for safety and reliability.. Using brainwave technology it was found that certain combinations of alpha,theta and delta harmonics caused beneficial changes in brain activity and changes in consciousness Does it Work? The simple answer is yes it does. These products are designed to work directly on the brainwave activity itself using a technique called frequency following. These products do NOT contain music or subliminal messages. Overwhelming scientific evidence suggests that accurate brainwave entrainment is not effective when embedded in music or accompanying subliminals. Vocal or musical content is only appropriate when attempting to work in the lighter alpha frequency ranges. For more information click on the VISIT WEBSITE button.