LRAD

Anyone ever heard of this little beaut?

I just watched a program on the History channel (Modern Marvels) where they describe this device.
It is used mostly as a long range communications device.
However...if you flip a switch, you can direct a beam of sound towards whatever target you wish and pretty much stop them in their tracks. What I like about it, is that it is non-lethal (unless of course whoever you are directing it at is driving , then they could wreck I gyess)
It reminds me of some earlier expirements that the goverment did using sound as a way to disperse/or disable crowds
A couple of links of interest

www.gdatp.com...

www.forteantimes.com...

www.findarticles.com...