That was my initial reaction too. Although this study I thought was very promising. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7349639/. Was thinking now of maybe ordering this from Amazon if my dad wanted to try some sound wave therapy. The study I thought was pretty convincing but idk if the tech from amazon is what was in the study (doubtful). https://www.amazon.com/Sound-Oasis-Virbroacoustic-Therapy-System/dp/B004MY0NRK