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2. 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 ...

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.

4. The tiny voice-activated spy recorder Amazon shoppers ... - AOL

   www.aol.com/news/tiny-voice-activated-spy...

   That being said, there are plenty of times when a covert audio recorder can come in … The post The tiny voice-activated spy recorder Amazon shoppers love is down to $54 appeared first on BGR.

5. Microcassette - Wikipedia

   en.wikipedia.org/wiki/Microcassette

   A Sony M-100MC Voice-Activated Mic n' Micro Microcassette Recorder and a microcassette Microcassettes were sometimes also used for storing digital data. For the programmable calculators of the HP-41-series (from 1979, r.), there was a magnetic tape storage device. Microcassettes have mostly been used for recording voice.

6. Nest Home Security Devices Have a Hidden Microphone ... - AOL

   www.aol.com/news/nest-home-security-devices...

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7. FBI penetrated New York-based Russian spy ring using hidden ...

   www.aol.com/article/2016/03/09/fbi-penetrated...

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