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One of the first covert listening devices was a large Seal of the Unitest States given by the Soviet Union to W. Averell Harriman, the United States Ambassador to the Soviet Union, on August 4, 1945
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- The Thing (listening device) - Wikipedia
Trojan Horse? Meet ̷T̷r̷o̷j̷a̷n̷ Soviet Eagle.
The method of transmission was pretty neat. It contained a passive antenna that would transmit vibrations when 'illuminated' with an EM field.
Also invented by the same guy who create the Theremin.