2 External component identification
Display
Item Component Description
(1) Internal display switch Turns off the display and initiates Sleep if the display is
closed while the power is on.
NOTE: The internal display switch is not visible from
the outside of the computer.
(2) WLAN antennas (2)* Send and receive wireless signals.
(3) Proximity sensors (2)* Detect your presence in front of the computer and turn on
the radiance backlight keyboard feature.
(4) Internal microphones (2) Record audio, automatically reducing ambient noise and
providing echo cancellation.
4 Chapter 2 External component identification