Long-range acoustic device
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A long-range acoustic device, acoustic hailing device, or sound cannon is a specialized loudspeaker and sound weapon that produces sound at high power for communicating at a distance. It has been used
An NYPD LRAD on top of a police humvee outside the 2004 Republican National Convention, hosted in Madison Square Garden in New York City
US Navy Ship with LRAD system aboard, 2010
An LRAD operator wearing hearing protection
An NYPD officer stands ready with the LRAD 500X at an Occupy Wall Street protest on November 17, 2011, near the city hall.
Active Denial System
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The Active Denial System is a directed-energy weapon developed by the U.S. military, designed for area denial, perimeter security and crowd control. Informally, the weapon is also called the heat ray
Long-range acoustic device
…maximum discomfort for the people targeted, as this is the frequency range at human hearing is most sensitive. Although sometimes referred to as an Active Denial System, the latter is based on a different technology, in which millimetre-wave radiation causes nerve receptors in the skin to feel heat, via dielectric…
An operational version of the Active Denial System (2008)