Dell XPS 18 (1810, Early 2013) - Manual (Page 6)

Features
This section provides information about the features available on your
computer.
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Feature Functionality
1 Power-adapter port Connect the supplied power adapter to
provide power to the computer and charge
the battery.
2 USB 3.0 ports (2) Connect USB devices for transferring or
synchronizing data, music, photos, videos,
contacts, and so on.
3 Audio port (3.5 mm) Connect headphones, microphones, and
other audio equipment to listen to stereo
sound, record audio, or make calls.
4 SD-card slot Full-sized SD-card slot.
5 Left speaker Provides audio output for video and music
playback.
6 │ Features