HP EliteBook 2540p Notebook PC - Manual (Page 52)

Component Description
(1) Webcam Records audio and video and captures still photographs.
(2) Internal microphones (2) Record sound.
NOTE: The internal microphones make use of dual array
technology, which provides speech enhancement and suppresses
surrounding noises.
(3) Volume up button Increases speaker volume.
(4) Volume down button Decreases speaker volume.
(5) Volume mute button Mutes and restores speaker sound.
(6) Audio-out (headphone) jack/Audio-in
(microphone) jack Produces sound when connected to optional powered stereo
speakers, headphones, ear buds, or a headset. Also connects an
optional headset microphone.
WARNING! To reduce the risk of personal injury, adjust the
volume before putting on headphones, earbuds, or a headset. For
additional safety information, refer to the Regulatory, Safety and
Environmental Notices.
NOTE: When a device is connected to the headphone jack, the
computer speakers are disabled.
(7) Speakers (2) Produce sound.
40 Chapter 4 Multimedia