LRAD sound weapons at protests use focused acoustic beams up to 162 decibels that cause permanent hearing damage, but distance and industrial earplugs provide effective protection.

On a suburban street in Maple Grove, a device first built for battlefields and warships was pointed at a crowd of Minnesota ...

During protests in the USA, security authorities use LRAD systems for announcements and crowd control. How do these "sound cannons" work?

Several police departments across America are planning to try a new device that uses focused sound, turned way up. These so-called non-lethal... Focused Sound 'Laser' for Crowd Control Crowd control ...