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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.
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 ...
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 ...
Wiretapping. Wiretapping, also known as wire tapping or telephone tapping, is the monitoring of telephone and Internet -based conversations by a third party, often by covert means. The wire tap received its name because, historically, the monitoring connection was an actual electrical tap on an analog telephone or telegraph line.
Countersurveillance refers to measures that are usually undertaken by the public to prevent surveillance, [1] including covert surveillance. Countersurveillance may include electronic methods such as technical surveillance counter-measures, which is the process of detecting surveillance devices. It can also include covert listening devices ...
Nonlinear junction detector. A bumblebee with a transponder acting as a non-linear junction for tracking the animal by way of harmonic radar. The non-linear junction detector, or an NLJD, is a device that illuminates a small region of space with high- frequency RF energy. Any "non linear junction" in the vicinity—for example, and particularly ...
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