Any time someone starts off with a review of when scientists were wrong, you know snake oil will follow.  In the section on bats they specifically mention how quickly ultrasound power drops off, but never discuss how that same bit of physics affects their main value proposition (hint: a lot).  The irony of them going on to say &quot;it&#x27;s terrible that companies sell these devices because they&#x27;re ripping people off&quot; is pretty thick.