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2. Belkin - Wikipedia

   en.wikipedia.org/wiki/Belkin

   Belkin also sells wall chargers, car chargers, charging stations, power banks, surge protectors, power strips, and wireless chargers for smartphones, tablets, smartwatches, laptops, computers, and other electronic devices. In 2016, Belkin released an iPhone-compatible adapter for simultaneous iPhone charging and headphone use. [29]

3. List of video connectors - Wikipedia

   en.wikipedia.org/wiki/List_of_video_connectors

   twin DVI (for two monitors via an adapter cable) Apple Display Connector: Combines DVI, USB, and power. HDMI connector plugs (male): Type D (Micro), Type C (Mini), and Type A. High-Definition Multimedia Interface (HDMI) High definition digital video devices (HDMI protocol)

4. Video door-phone - Wikipedia

   en.wikipedia.org/wiki/Video_door-phone

   A video door-phone (also known as a video door entry or video intercom) is a stand-alone intercom system used to manage calls made at the entrance to a building (residential complex, detached family home, workplace, etc.) with access controlled by audiovisual communication between the inside and outside. The main feature of video door entry is ...

5. XLR connector - Wikipedia

   en.wikipedia.org/wiki/XLR_connector

   XLR3 cable connectors female (left) and male. The XLR connector is a type of electrical connector primarily used in professional audio, video, and stage lighting equipment. XLR connectors are cylindrical, with three to seven connector pins, and are often employed for analog balanced audio interconnections, AES3 digital audio, portable intercom, DMX512 lighting control, and for low-voltage ...

6. Intercom - Wikipedia

   en.wikipedia.org/wiki/Intercom

   A modern four-wire intercom system capable of 272 sources and destinations manufactured by Telex Communications Inc. In the mid-90s four-wire technology started gaining more prominence due to the technology getting cheaper and smaller. Four-wire circuit technology had been around for quite some time but was very expensive to implement.

7. Duplex (telecommunications) - Wikipedia

   en.wikipedia.org/wiki/Duplex_(telecommunications)

   A duplex communication system is a point-to-point system composed of two or more connected parties or devices that can communicate with one another in both directions. Duplex systems are employed in many communications networks, either to allow for simultaneous communication in both directions between two connected parties or to provide a reverse path for the monitoring and remote adjustment ...