Compaq Armada V300 Series Reference Manual page 99

Volume button (down)
Volume button (up)
Microphone jack
Stereo speaker/headphone
jack
Internal microphone
With stereo speakers muted, system beeps are still audible
unless they have been turned off.
!
The internal microphone is disabled when an electret condenser
microphone with a 3.5-mm plug is plugged into the microphone
line-in jack.
A stereo electret condenser microphone in the mono
microphone jack is acceptable, but the left channel will be
recorded on both the left and right channels. A dynamic
microphone will not achieve the recommended sensitivity.
Decreases volume to the built-in
speakers, to external speakers, or to
headphones plugged into the stereo
speaker/headphone jack on the
computer.
Increases volume to the built-in
speakers, to external speakers, or to
headphones plugged into the stereo
speaker/headphone jack on the
computer.
Connects an external mono
microphone. The jack requires a
3.5-mm, 2-conductor or 3-conductor
plug.
Connects headphones, head set, or
external speakers to the computer.
The jack requires a 3.5-mm,
3-conductor plug.
Built-in monophonic microphone for
the multimedia sound system. The
internal microphone supports audio
input for spoken comments.