HP V300 manual Using Internal and External Microphones, Control before putting on headphones

3 Volume button (down)	Decreases volume to the built-in
	speakers, to external speakers, or to
	headphones plugged into the stereo
	speaker/headphone jack on the
	computer.
4 Volume button (up)	Increases volume to the built-in
	speakers, to external speakers, or to
	headphones plugged into the stereo
	speaker/headphone jack on the
	computer.
5 Microphone jack	Connects an external mono
	microphone. The jack requires a
	3.5-mm, 2-conductor or 3-conductor
	plug.
6 Stereo speaker/headphone	Connects headphones, head set, or
jack	external speakers to the computer.
	The jack requires a 3.5-mm,
	3-conductor plug.
7 Internal microphone	Built-in monophonic microphone for
	the multimedia sound system. The
	internal microphone supports audio
	input for spoken comments.

NOTE: With stereo speakers muted, system beeps are still audible unless they have been turned off.

!	WARNING: To reduce the risk of personal injury, adjust the volume
	control before putting on headphones.

Using Internal and External Microphones

The internal microphone is disabled when an electret condenser microphone with a 3.5-mm plug is plugged into the microphone line-in jack.

IMPORTANT: 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.

10-2 Using Audio Features