Dell Inspiron 11 (3147, Mid 2014) - Manual (Page 60)

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USB
Side-surround sound port — Connect left/right speakers.
RCA S/PDIF port — Transmits digital audio without the
need of analog audio conversion.
Optical S/PDIF port — Transmits digital audio,
using optical signals, without the need of analog
audio conversion.
USB
Universal Serial Bus (USB) allows you to connect peripherals to a computer
or a tablet. These peripherals include mouse, keyboard, printer, external
drives, cameras, phones, and so on.
USB port may be used to transfer data between your computer and the
device and also to charge supported devices. For more information, see the
documentation for your device.
Some computer also have USB ports with integrated PowerShare feature
that allows you to charge your USB devices even when the computer in
turned off.
USB also supports Plug‑and‑Play and hot swapping.
Plug-and-Play — Allows your computer to recognize and configure a
device automatically.
Hot swapping — Allows you to remove and connect USB devices without
restarting your computer.
USB Ports
Standard USB — The standard USB port is present on most laptops and
desktops. Most USB device connect to the computer using this port.
Mini-USB — A mini‑USB port is used in small electronic devices such as
cameras, external storage drives, tablets, and so on.
Micro-USB — A micro‑USB port is smaller than mini‑USB port and is used in
phones, tablets, wireless headphones, and other small electronic devices.