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2. Covert listening device - Wikipedia

   en.wikipedia.org/wiki/Covert_listening_device

   The recording device was concealed on a person Thatcher had previously approached for help in the crime. [citation needed] Electronic bugging devices were found in March 2003 at offices used by French and German delegations at the European Union headquarters in Brussels. Devices were also discovered at offices used by other delegations.

3. Cellphone surveillance - Wikipedia

   en.wikipedia.org/wiki/Cellphone_surveillance

   Intentionally hiding a cell phone in a location is a bugging technique. Some hidden cellphone bugs rely on Wi-Fi hotspots , rather than cellular data, where the tracker rootkit software periodically "wakes up" and signs into a public Wi-Fi hotspot to upload tracker data onto a public internet server.This is also legal

4. Phone surveillance - Wikipedia

   en.wikipedia.org/wiki/Phone_surveillance

   Phone surveillance is the act of performing surveillance on phone conversations, location tracking, and data monitoring of a phone. Before the era of mobile phones, these used to refer to the tapping of phone lines via a method called wiretapping. Wiretapping has now been replaced by software that monitors the cell phones of users.

5. Stingray phone tracker - Wikipedia

   en.wikipedia.org/wiki/Stingray_phone_tracker

   When operating in active mode, the Stingray device mimics a wireless carrier cell tower in order to force all nearby mobile phones and other cellular data devices to connect to it. The StingRay is an IMSI-catcher with both passive (digital analyzer) and active (cell-site simulator) capabilities.

6. The Thing (listening device) - Wikipedia

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

   The device, a passive cavity resonator, became active only when a radio signal of the correct frequency was sent to the device from an external transmitter. This is referred to in NSA parlance as "illuminating" a passive device. Sound waves (from voices inside the ambassador's office) passed through the thin wood case, striking the membrane and ...

7. Wireless security camera - Wikipedia

   en.wikipedia.org/wiki/Wireless_security_camera

   Digital wireless camera. Wireless security cameras are closed-circuit television (CCTV) cameras that transmit a video and audio signal to a wireless receiver through a radio band. Many wireless security cameras require at least one cable or wire for power; "wireless" refers to the transmission of video/audio.