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2. Laser microphone - Wikipedia

   en.wikipedia.org/wiki/Laser_microphone

   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. The object is typically inside a room where a conversation is taking place and can be anything that can vibrate (for example, a picture on a wall) in ...

3. Covert listening device - Wikipedia

   en.wikipedia.org/wiki/Covert_listening_device

   A covert listening device, more commonly known as a bug or a wire, is usually a combination of a miniature radio transmitter with a microphone. The use of bugs, called bugging, or wiretapping is a common technique in surveillance, espionage and police investigations. Self-contained electronic covert listening devices came into common use with ...

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. Walmart patents surveillance tool that can eavesdrop on workers

   www.engadget.com/2018-07-12-walmart-patent-audio...

   Walmart. It looks like Amazon and Walmart, which have long been battling it out in the retail arena, both want to keep a very close eye on their workers. Earlier this year, Amazon patented smart ...

6. Closed-circuit television - Wikipedia

   en.wikipedia.org/wiki/Closed-circuit_television

   Surveillance cameras on the corner of a building. Surveillance camera in a residential community. Dome camera in Rotterdam central metro station. Closed-circuit television ( CCTV ), also known as video surveillance, [ 1][ 2] is the use of closed-circuit television cameras to transmit a signal to a specific place, on a limited set of monitors.

7. Passive radar - Wikipedia

   en.wikipedia.org/wiki/Passive_radar

   Passive radar. Passive radar (also referred to as parasitic radar, passive coherent location, passive surveillance, and passive covert radar) is a class of radar systems that detect and track objects by processing reflections from non-cooperative sources of illumination in the environment, such as commercial broadcast and communications signals.