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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. The Thing (listening device) - Wikipedia

   en.wikipedia.org/wiki/The_Thing_(listening_device)

   The device, embedded in a carved wooden plaque of the Great Seal of the United States, was used by the Soviet government to spy on the US. On August 4, 1945, several weeks before the end of World War II , a delegation from the Young Pioneer Organization of the Soviet Union presented the bugged carving to Ambassador Harriman, as a "gesture of ...

4. Laser microphone - Wikipedia

   en.wikipedia.org/wiki/Laser_microphone

   [1] [2] Lavrentiy Beria, head of the KGB, had used this Buran device to spy on the U.S., British, and French embassies in Moscow. [ 2 ] On 25 August 2009, U.S. patent 7,580,533 was issued for a device that uses a laser beam and smoke or vapor to detect sound vibrations in free air ("Particulate Flow Detection Microphone based on a laser ...

5. 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.

6. Surveillance tools - Wikipedia

   en.wikipedia.org/wiki/Surveillance_tools

   Covert listening devices or "bugs", tiny, hidden microphone and short-range radio transmitter; directional microphones; primarily chemical Artificial noses; Chemical markers like UV markers; DNA sensors: Biochip etc., for screening tiniest traces of body material; Other Airplanes, unmanned aerial vehicles and satellites; Night-vision goggles or ...

7. Cellphone surveillance - Wikipedia

   en.wikipedia.org/wiki/Cellphone_surveillance

   Cellphone surveillance (also known as cellphone spying) may involve tracking, bugging, monitoring, eavesdropping, and recording conversations and text messages on mobile phones. [1] It also encompasses the monitoring of people's movements, which can be tracked using mobile phone signals when phones are turned on.