The sound conditioner is one of the oldest examples of “personal therapy sensory devices.” The market for these technologies was said to be more than a billion dollars back in 2006, in a rare moment when someone bothered to study them.
The sound conditioner is one of the oldest examples of “personal therapy sensory devices.” The market for these technologies was said to be more than a billion dollars back in 2006, in a rare moment when someone bothered to study them.