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2. 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. Self-contained electronic covert listening devices came into common use with ...

3. Megaphone - Wikipedia

   en.wikipedia.org/wiki/Megaphone

   A small sports megaphone for cheering at sporting events, next to a 3 inch cigarette lighter for scale. A megaphone, speaking trumpet, bullhorn, blowhorn, or loudhailer is usually a portable or hand-held, cone-shaped acoustic horn used to amplify a person's voice or other sounds and direct it in a given direction.

4. Microphone - Wikipedia

   en.wikipedia.org/wiki/Microphone

   Microphones are used in many applications such as telephones, hearing aids, public address systems for concert halls and public events, motion picture production, live and recorded audio engineering, sound recording, two-way radios, megaphones, and radio and television broadcasting.

5. The Thing (listening device) - Wikipedia

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

   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.

6. Electro-Voice RE20 - Wikipedia

   en.wikipedia.org/wiki/Electro-Voice_RE20

   Electro-Voice RE20. Stevie Wonder singing into an RE20 in 1973. The Electro-Voice RE20 is an American professional cardioid dynamic microphone, commonly used in broadcasting applications since 1968. Designed by Electro-Voice using the company's patented Variable-D technology and a large-diaphragm element, it has been described as an industry ...

7. Lavalier microphone - Wikipedia

   en.wikipedia.org/wiki/Lavalier_microphone

   Lavalier microphone. A lavalier microphone or lavalier (also known as a lav, lapel mic, clip mic, body mic, collar mic, neck mic or personal mic) is a small microphone used for television, theater, and public speaking applications to allow hands-free operation. They are most commonly provided with small clips for attaching to collars, ties, or ...