Critics have slammed American police officers after they trained an ear-splitting 'spotlight of sound' on G20 protesters in Pittsburgh last week.
The device can beam 'unbearable' alarm tones and voice commands to nearly two miles away. To a person standing three feet in front of it, it is louder than a jet engine.
The device, called a Long Range Acoustic Device (LRAD), concentrates sound in a 30- or 60-degree cone.
It is about two feet square and mounted on a swivel such that one person can point it where it is needed.
The volume measures 140-150 decibels three feet away - louder than a jet engine - but dissipates with distance.
Robert Putnam, spokesman for the manufacturer, San Diego-based American Technology Corp., said it's 'like a big spotlight of sound that you can shine on people.'
'It's not a sonic cannon. It's not the death ray or anything like that,' Putnam ins
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