Sound blaster protests, sales rise

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Rather than batons or rubber bullets, some police departments have started using an intense beam of sound to manage protesters, but the annoying tone has drawn criticism from some who say it can cause permanent damage. More U.S. police and emergency-response agencies are using the so-called Long-Range Acoustic Devices instead of megaphones or conventional loudspeakers for crowd control. The leading manufacturer said the product was developed as a nonlethal option for military use.

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