Dell LATITUDE C510 - Manual (Page 14)

Attach headphones or speakers to the connector.
Attach a microphone to the connector.
Infrared Sensor
The infrared sensor lets you transfer files from your computer to another infrared-compatible device without
using cable connections.
When you receive your computer, the infrared sensor is disabled. To enable the infrared sensor, see " Using
the System Setup Program ." For information on transferring data, see the documentation that came with