LRAD

The LRAD (Long Range Acoustic Device) can emit a tone higher than the normal human threshold of pain. It was used for the first time in the USA in Pittsburgh during the time of G20 summit on September 24-25th, 2009.

By the way, a good book about it: Sonic Warfare – Sound, Affect, and the Ecology of Fear by Steve Goodman (See this review on Rhizome).

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