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2. Coaxial power connector - Wikipedia

   en.wikipedia.org/wiki/Coaxial_power_connector

   Nokia 2-mm DC Charging Interface Specification [3] 4.65–9.3 V Nokia DC-096 (0.48×2.1 mm on socket side) Nokia AC-3 charger Nokia 2-mm DC Charging Interface, used in Nokia phones and Bluetooth headphones 2.35 0.70 9.5 A EIAJ-01 0–3.15 V Kobiconn 3218-EX Lumberg 1636 01 Kobiconn 0307-EX (inline)

3. Phone connector (audio) - Wikipedia

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

   The use of headphone jacks in smartphones is declining as of 2020 in favor of USB-C connectors and wireless Bluetooth solutions. Consumer electronics devices such as digital cameras, camcorders, and portable DVD players use 3.5 mm connectors for composite video and audio output. Typically, a TRS connection is used for mono unbalanced audio plus ...

4. USB-C - Wikipedia

   en.wikipedia.org/wiki/USB-C

   USB-C plug USB-C (SuperSpeed USB 5Gbps) receptacle on a laptop. USB-C, or USB Type-C, is a 24-pin, reversible connector (not a protocol) that supersedes previous USB connectors and can carry audio, video, and other data, to connect to monitors, external drives, hubs/docking stations, mobile phones, and many more peripheral devices.

5. Microphone connector - Wikipedia

   en.wikipedia.org/wiki/Microphone_connector

   Two pins are used for the mono headphone signal and two pins for the unbalanced microphone signal. The 4-pin XLR connector is also commonly used on amateur radio microphones, but transferring unbalanced audio instead, and using the 4th pin (with the common ground) for a push-to-talk (PTT) circuit activated by a button on the microphone.

6. Dual headphone adapter - Wikipedia

   en.wikipedia.org/wiki/Dual_Headphone_Adapter

   A dual headphone adapter, also known as a "headphone splitter" or "audio jack splitter", is a device that allows two headphones to be connected through to one audio jack. [1] They can be used to listen to audio through multiple audio input devices, such as headphones on devices such as an MP3 player , CD player , modern Computer with audio-out ...

7. Audio headset - Wikipedia

   en.wikipedia.org/wiki/Audio_headset

   General 3.5 mm computer headsets come with two 3.5 mm connectors: one connecting to the microphone jack and one connecting to the headphone/speaker jack of the computer. 3.5 mm computer headsets connect to the computer via a sound card, which converts the digital signal of the computer to an analog signal for the headset. USB computer headsets ...