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.<br /><br />Microwaves penetrate through walls, brick, etc... Ultrasound does not penetrate.<br /><br />See also The Acoustic Heterodyne, another ultrasound device that can also be used to apply Silent Sound to targeted Individuals.
