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The optical bug is a high-tech toy
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that shoots a light beam in a window.
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It picks up vibrations from the glass
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and translates it into speech.
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How's that one? Can I see it?
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You can't see the beam with the naked eye,
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but take the infrared filter off a digital camera,
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and it shows up nicely.
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As high-tech as a laser mic is, they're not hard to defeat.
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They pick up vibrations on the glass,
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so you supply your own vibrations.
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You had to do that now?