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2. 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 ...

3. Motorola DynaTAC - Wikipedia

   en.wikipedia.org/wiki/Motorola_DynaTAC

   A DynaTAC 8000X; the first commercially available mobile phone from 1983. Electrical engineer Martin Cooper of Motorola made the first publicized handheld mobile phone call on a prototype DynaTAC model on April 3, 1973. This is a reenactment in 2007. The DynaTAC is a series of cellular telephones manufactured by Motorola from 1983 to 1994.

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. 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.

7. List of mobile phone brands by country - Wikipedia

   en.wikipedia.org/wiki/List_of_mobile_phone...

   Bankruptcy in 2006, defunct in 2007. Grundig Mobile. Hagenuk Telecom GmbH. insolvency in 1997, mobile phone development and manufacturing business acquired by Telital in 1998 [9] Siemens Mobile. Acquired by BenQ Corporation in 2005 to form BenQ Mobile. Telefunken. Italy. Onda Mobile Communication.