Videos

Posted by Annabelley on April 25, 2011 at 2:40am

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<iframe width="480" height="390" src="http://www.youtube.com/embed/8wJ5Eff7hx0" frameborder="0"></iframe>

spotlight, audio, beams, ultrasonic

Loudspeaker focusses ultrasonic beams which turn into audio near the target.

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