While thousands of people are gathering in Union Square for a candle-light vigil, NYPD is equipped with Long Range Acoustic Device (LRAD), a 45-pound mega-megaphone which can cause permanent hearing damage. LRAD was developed by American Technology Corp. of San Diego which got a $1.1 million (U.S.) contract from the U.S. Marine Corps. According to Wikipedia, the device was originally intended to be used by American warships to warn incoming vessels of their arrival.
Here are more information on Long Range Acoustic Devices:
Long Range Acoustic Device from Wikipedia
Long Range Acoustic Device from indybay.
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