The Audio Spotlight by Holosonics®

[sleepy]

This is a device which produces a beam of highly-directional sound modulated on an ultrasonic carrier.

http://www.holosonics.com/index.html

And this is the fellow who apparently invented The Audio Spotlight,
Dr. F. Joseph Pompeii, there in the lower right corner holding one version of the device:

http://www.holosonics.com/contact.html