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2. iPhone - Wikipedia

   en.wikipedia.org/wiki/IPhone

   As of November 1, 2018, more than 2.2 billion iPhones had been sold. The iPhone was the first mobile phone to use multi-touch technology. Since the iPhone's launch, it has gained larger screen sizes, video-recording, waterproofing, and many accessibility features.

3. Koss Corporation - Wikipedia

   en.wikipedia.org/wiki/Koss_Corporation

   Based in Milwaukee, Wisconsin, United States, in 1991 Koss Audio & Video Electronics started producing and selling consumer electronics products as a separate company in Hazelwood, Missouri, United States. The Koss family owns more than 75% of the firm. Having only a high school education, John C. Koss worked with Lange, an engineer, to develop ...

4. Electrophone (information system) - Wikipedia

   en.wikipedia.org/wiki/Electrophone_(information...

   Electrophone (information system) The Electrophone was a distributed audio system that operated in the United Kingdom, primarily in London, between 1895 and 1925. Using conventional telephone lines, it relayed live theatre performances, music hall shows, and Sunday church services to subscribers who listened over special headsets.

5. Headphone amplifier - Wikipedia

   en.wikipedia.org/wiki/Headphone_amplifier

   Effectively, a headphone amplifier is a small power amplifier that can be connected to a standard headphone jack or the line output of an audio source. Electrically, a headphone amplifier can be thought of as an amplifier that presents a very high input impedance (ideally infinite) and presents a lower output impedance (ideally zero) and larger ...

6. Virtual reality headset - Wikipedia

   en.wikipedia.org/wiki/Virtual_reality_headset

   Virtual reality headset. A virtual reality headset (or VR headset) is a head-mounted device that uses 3D near-eye displays and positional tracking to provide a virtual reality environment for the user. VR headsets are widely used with VR video games, but they are also used in other applications, including simulators and trainers.

7. Phone connector (audio) - Wikipedia

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

   Invented in the late 19th century for telephoneswitchboards, the phone connector remains in use for interfacing wired audio equipment, such as headphones, speakers, microphones, mixing consoles, and electronic musical instruments(e.g. electric guitars, keyboards, and effects units). A maleconnector(a plug), is mated into a femaleconnector (a ...