Acoustic weapons, also known as long-range acoustic devices and sound cannons
description: Acoustic weapons, also known as long-range acoustic devices and sound cannons, are devices that deliver very loud sounds over long distances. This technology is used for crowd-control purposes by emitting loud and painful levels of noise that may lead to significant harm to the ears, potentially causing hearing loss. Serious questions remain about the safety and efficacy of acoustic weapons in crowd-control contexts.
source: https://assets.aclu.org/live/uploads/document/Acoustic_Weapons.pdf