Ultrasound Hearing For Organized Stalking of Targeted Individuals

The Audio Spotlight, a device that uses ultrasound to project audible sound with pinpoint accuracy, can also be used by Organized Stalkers as a psychological weapon against Targeted Individuals.

Microwaves penetrate through walls, brick, etc... Ultrasound does not penetrate.

See also The Acoustic Heterodyne, another ultrasound device that can also be used to apply Silent Sound to targeted Individuals.