Dell XPS 14 (L401X, Late 2010) - Manual (Page 29)

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Using Your XPS Laptop
1 USB 2.0 connector — Connects to USB devices, such as a mouse, keyboard, printer,
external drive, or MP3 player.
2 Audio-in/Microphone connector — Connects to a microphone or inputs signal for
use with audio programs.
3 Audio-out/Headphone/digital S/PDIF connector — Connects to a pair of
headphones, powered speaker, or sound system. Can also be used to connect to
amplifiers, speakers, or TVs for digital audio output through optical digital cables.
4 Audio-out/Headphone connector — Connects to a pair of headphones or to a
powered speaker or sound system.