Ultra-sonic help for your presentations?

Oh, good grief!

I have Google Alerts set up for key phrases that interest us – things to do with presentations and presenting etc.  Today I got one which linked to this aid for public speaking.

Can someone explain to me what they mean?  If it’s ultra-sonic then by definition we won’t be able to hear it and so it can’t have any effect, subliminal or not.  If we can hear it, it’s not ultra-sonic and so the title is wrong… in which case would you trust the content?

I stress I’ve not tried the product, it may be great, but don’t you think they’d have got a better title……?  ;)