Dell Alienware M17x R3 (Early 2011) - Manual (Page 26)

CHAPTER 2: GETTING TO KNOW YOUR LAPTOP
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6 USB 3.0 connectors (2) — Provide faster data transmission between your
computer and USB devices.
7 Audio-out/Headphone/S/PDIF connector — Connects to amplifiers, speakers,
or TVs for digital audio output. Can also be used to connect to a pair of headphones,
powered speakers, or sound system.
NOTE: Use the S/PDIF adapter that shipped with your computer, to connect a TOSLINK
optical cable.
8 Microphone connector — Connects to a microphone or inputs signal for use with
audio programs.
9 Headphone connectors (2) — Connect to a pair of headphones or to a powered
speaker or sound system.