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2. Covert listening device - Wikipedia

   en.wikipedia.org/wiki/Covert_listening_device

   A laser microphone can be used to reconstruct audio from a laser beam shot onto an object in a room, or the glass pane of a window. Researchers have also prototyped a method for reconstructing audio from video of thin objects that can pick up sound vibrations, such as a houseplant or bag of potato chips. [18]

3. Wireless microphone - Wikipedia

   en.wikipedia.org/wiki/Wireless_microphone

   A wireless microphone, or cordless microphone, is a microphone without a physical cable connecting it directly to the sound recording or amplifying equipment with which it is associated. Also known as a radio microphone , it has a small, battery-powered radio transmitter in the microphone body, which transmits the audio signal from the ...

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. Cross-device tracking - Wikipedia

   en.wikipedia.org/wiki/Cross-device_tracking

   Now, cross-device tracking has evolved into a new, radical form of surveillance technology which enables users to be tracked across multiple devices, including smartphones, TVs, and personal computers through the use of audio beacons, or inaudible sound, emitted by one device and recognized through the microphone of the other device, usually a ...

6. MIPRO - Wikipedia

   en.wikipedia.org/wiki/MIPRO

   MIPRO Electronics Co., Ltd. (Chinese: 嘉強電子), established in 1995, is an ISO-9001 certified Taiwan-based company that designs and manufactures wireless microphones, portable wireless public address and other wireless audio equipment for consumer, professional and commercial applications.

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.