Dell Inspiron 1520 (Mid 2007) - Manual (Page 28)

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About Your Computer
CAUTION:
Do not block, push objects into, or allow dust to accumulate in the air
vents. Do not store your computer in a low-airflow environment, such as a closed
briefcase, while it is running. Restricting the airflow can damage the computer or
cause a fire.
AIR VENTS — The computer uses an internal fan to create airflow through the vents,
which prevents the computer from overheating. The computer turns the fan on when
the computer gets hot. Fan noise is normal and does not indicate a problem with the
fan or the computer.
AUDIO CONNECTORS
E XPRESS C ARD SLOT — Supports one ExpressCard. The computer ships with a
plastic blank installed in the slot. For more information, see "Using ExpressCards" on
page 87.
Attach headphones to the connector.
Attach a microphone to the connector.