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  2. Covert listening device - Wikipedia

    en.wikipedia.org/wiki/Covert_listening_device

    Listening devices of the East German security services. 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.

  3. Wireless security camera - Wikipedia

    en.wikipedia.org/wiki/Wireless_security_camera

    Analog wireless is the transmission of audio and video signals using radio frequencies. Typically, analog wireless has a transmission range of around 300 feet (91 meters) in open space; walls, doors, and furniture will reduce this range. Analog wireless is found in three frequencies: 900 MHz, 2.4 GHz, and 5.8 GHz.

  4. Electronic monitoring in the United States - Wikipedia

    en.wikipedia.org/wiki/Electronic_monitoring_in...

    GPS-based tracking system used for some individuals released from prison, jail or immigrant detention. According to a survey distributed by The Pew Charitable Trusts in December 2015, "the number of accused and convicted criminal offenders in the United States who are supervised with ankle monitors and other GPS-system electronic tracking devices rose nearly 140 percent over 10 years ...

  5. Countersurveillance - Wikipedia

    en.wikipedia.org/wiki/Countersurveillance

    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.

  6. Category:Audio surveillance - Wikipedia

    en.wikipedia.org/wiki/Category:Audio_surveillance

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us

  7. Security alarm - Wikipedia

    en.wikipedia.org/wiki/Security_alarm

    A wireless system can be moved to a new property easily. An important wireless connection for security is between the control panel and the monitoring station. Wireless monitoring of the alarm system protects against a burglar cutting cables or from failures of an internet provider. This setup is commonly referred to as fully wireless.

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