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  2. Covert listening device - Wikipedia

    en.wikipedia.org/wiki/Covert_listening_device

    During World War II, the Nazis took over a Berlin brothel, Salon Kitty, and used concealed microphones to spy on patrons. Also during the war, the British used covert listening devices to monitor captured German fighter pilots being held at Trent Park. In the late 1970s, a bug was discovered in a meeting room at the OPEC headquarters in Vienna.

  3. Laser microphone - Wikipedia

    en.wikipedia.org/wiki/Laser_microphone

    A laser microphone is a surveillance device that uses a laser beam to detect sound vibrations in a distant object. It can be used to eavesdrop with minimal chance of exposure. It can be used to eavesdrop with minimal chance of exposure.

  4. The Thing (listening device) - Wikipedia

    en.wikipedia.org/wiki/The_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. 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.

  5. Surveillance tools - Wikipedia

    en.wikipedia.org/wiki/Surveillance_tools

    Surveillance tools are all means of technology provided and used by the ... Covert listening devices or "bugs", tiny, hidden microphone and short-range radio ...

  6. Acoustic Kitty - Wikipedia

    en.wikipedia.org/wiki/Acoustic_Kitty

    Acoustic Kitty was a Central Intelligence Agency (CIA) project launched by their Directorate of Science & Technology in the 1960s, which intended to use cats to spy on the Kremlin and Soviet embassies.

  7. Microphone - Wikipedia

    en.wikipedia.org/wiki/Microphone

    The distance between the microphone's light source and its photodetector may be up to several kilometers without need for any preamplifier or another electrical device, making fiber-optic microphones suitable for industrial and surveillance acoustic monitoring.

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