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The Thing (listening device)
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Audio bug to spy on US embassy in Moscow
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Wikipedia

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. It was concealed inside a gift given by the Soviet Union to W. Averell Harriman, the United States Ambassador to the Soviet Union, on August 4, 1945. Because it was passive, needing...

Instance of
Covert listening device
Microwave cavity
Location
Spaso House
United Nations Security Council
Discoverer / Inventor
Leon Theremin
References
Wikidata