HP ProBook 4520s Notebook PC and HP ProBook 4720s Notebook PC - Maintenance and Service Guide

Component Description
(1) Internal display switch Turns off the display if the display is closed while the power is on.
(2) Internal microphone Records sound.
(3) Webcam light (select models only) On: The webcam is in use.
(4) Webcam (select models only) Records audio and video and captures still photographs.
18 Chapter 2 External component identification