Acoustic harassment device

[4] While they have proven effective over the short-term, animals tend to become conditioned over time and can even be drawn to the sounds once they habituate to the lack of real danger and the presence of sustenance.

[1] Primitive harassment methods included firecrackers, rubber bullets, chasing animals by boat, banging pipes and seal bombs (incendiary devices).

[7] Acoustic devices have been used for military purposes including to stress enemies, as an aid in interrogation, and to create "an infrasonic sound barrier".

[8] Audio harassment was also used by the U.S. military in the Vietnam War and was famously depicted in the fictional movie Apocalypse Now as helicopters descend on the enemy with loud speakers.

[8] Other examples include the 350 watt HPS-1 Sound System that could be heard 2.5 miles away and was used on the Vatican embassy in Panama where ousted president Manuel Noriega was in refuge.

An acoustic pinger ( active sonar ) used to repel cetaceans (including dolphins and porpoises) away from fishing nets
Law enforcement officer holding a Hypershield , an acoustic hailing device used for crowd and riot control
One use of LRADs (long range audio devices) is deploying them to prevent people from entering line of fire areas