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Thing (listening device)

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The bug was placed in the Great Seal of the United States and hung in the US ambassadors home here. 

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Thing (listening device)

The Thing, also known as the Great Seal bug, was one of the first covert listening devices (or "bugs") to use passive techniques to transmit an audio signal. Because it was passive, being energized and activated by electromagnetic energy from an outside source, it is considered a predecessor of current RFID technology.

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