It is a very useful and original product. Using it a few times a day, I noticed an unusual ease in relaxing and falling asleep. Since I was also looking to have lucid dream experiences, I was able to experience substantial improvement when meditating alongside the machine's delta wave frequency. I don't know if it would be possible to include the possibility in future updates of being able to choose other frequencies beyond the typified ones, being able to try the different numbers and thus exploring altered states of consciousness. Be that as it may, the experience with the machine is pleasant and it constitutes a very powerful research and healing tool.