HP ProBook 4540s HP Notebook User Guide - Linux - Page 28
Regulatory, Safety, and Environmental Notices
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Component Description (1) WLAN antennas (2)* Send and receive wireless signals to communicate with wireless local area networks (WLAN). (2) Internal microphones (1 or 2 depending on Record sound. model) (3) Webcam light (select models only) On: The webcam is in use. (4) Webcam (select models only) Records video and captures still photographs. (5) Internal display switch Turns off the display or initiates Suspend if the display is closed while the power is on. NOTE: The display switch is not visible from the outside of the computer. *The antennas are not visible from the outside of the computer. For optimal transmission, keep the areas immediately around the antennas free from obstructions. To see wireless regulatory notices, refer to the section of the Regulatory, Safety, and Environmental Notices that applies to your country or region. 18 Chapter 2 Getting to know your computer