Long-range acoustic device

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Notion

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Science and technology

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What Wikipedia says

A long-range acoustic device (LRAD), acoustic hailing device (AHD), or sound cannon is a specialized loudspeaker and sound weapon that produces sound at high power for communicating at a distance.

Excerpt from the Wikipedia article “Long-range acoustic device”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: SPC Brian Chaney, Public domain, via Wikimedia Commons.