Dell Precision M20 - Manual (Page 5)

infrared sensor — Lets you transfer files from your computer to another infrared-compatible device without using cable connections.
When you receive your computer, the sensor is disabled. You can use the system setup program to enable the sensor. For information on transferring data,
see Windows Help, the Help and Support Center, or the documentation that came with your infrared-compatible device.
audio connectors
hard drive — Stores software and data.
security cable slot — Lets you attach a commercially available antitheft device to the computer. For more information, see the instructions included with the
device.
Right View
Attach headphones or speakers to the connector.
Attach a microphone to the connector.
NOTICE: Before you buy an antitheft device, ensure that it will work with the security cable slot.