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2. Audio headset - Wikipedia

   en.wikipedia.org/wiki/Audio_headset

   Telephone headsets connect to a fixed-line telephone system. A telephone headset functions by replacing the handset of a telephone. Headsets for standard corded telephones are fitted with a standard 4P4C commonly called an RJ-9 connector. Headsets are also available with 2.5mm jack sockets for many DECT phones and other applications.

3. Headphones - Wikipedia

   en.wikipedia.org/wiki/Headphones

   A telephone headset functions by replacing the handset of a telephone. Headsets for standard corded telephones are fitted with a standard 4P4C commonly called an RJ-9 connector. Headsets are also available with 2.5 mm jack sockets for many DECT phones and other applications. Cordless bluetooth headsets are available, and often used with mobile ...

4. Phone connector (audio) - Wikipedia

   en.wikipedia.org/wiki/Phone_connector_(audio)

   Phone connector (audio) Phone plug mated in a phone socket. The plug's grooved tip is held firmly by the socket's spring tip contact. When not mated, this spring instead connects to the flat switch contact for detecting a plug. A phone connector is a family of cylindrically -shaped electrical connectors primarily for analog audio signals.

5. Sound-powered telephone - Wikipedia

   en.wikipedia.org/wiki/Sound-powered_telephone

   Modern emergency telephone powered by sound alone. A sound-powered telephone is a communication device that allows users to talk to each other with the use of a handset, similar to a conventional telephone, but without the use of external power. This technology has been used since at least 1944 [1] for both routine and emergency communication ...

6. Sidetone - Wikipedia

   en.wikipedia.org/wiki/Sidetone

   Sidetone. Sidetone is audible feedback to someone speaking or otherwise producing sound as an indication of active transmission. Sidetone is introduced by some communications circuits and anti-sidetone circuitry is used to control its level. Sidetone is expected behavior for telephone systems. Absence of sidetone can cause users to believe the ...

7. List of Sony Ericsson products - Wikipedia

   en.wikipedia.org/wiki/List_of_Sony_Ericsson_products

   HPM-62 stereo headset with non-removable earbuds (black) HPM-64 stereo headset included with some of the company phones, including a few walkman branded ones. This walkman branded version of this headset is also branded with BassReflex, which is a technology that improves the Bass quality. First headset with 3.5 mm jack to swap headphones.