The devices on that page probably do something, but probably
not all that the marketing copy would have you believe.
For info on a real ultrasonic pain inducer, check out:
These devices use the mixing of two ultrasonic beams
to produce another acoustic signal at the absolute difference
of the original frequencies. Besides inducing pain, other
variations of the device can send "voices" and other sounds
to people which seem to them to be originating inside their
Mind Control: TT&P ==> http://www.datafilter.com/mc
Home page: http://www.datafilter.com/alb
Polytechforum.com is a website by engineers for engineers. It is not affiliated with any of manufacturers or vendors discussed here.
All logos and trade names are the property of their respective owners.