Chicago Sun-Times
The 2012 NATO Chicago Summit brings world leaders to Chicago May 20-21

Chicago Police demonstrate two LRAD communication devices

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[ABC7 ]( that Chicago Police have two new $20,000 LRADs-Long Range Acoustic Devices-ready for the Chicago NATO Summit. The devices can be used to broadcast messages to crowds up to a kilometer away. Although the devices are also capable of emitting a high-decibel screech to disperse crowds, Chicago Police say they don’t intend to use the devices that way.

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