HP ProBook 4720s Notebook-PC - Manual (Page 13)

Component Description
(5) Power light ● On: The computer is on.
● Blinking: The computer is in the Suspend state.
● Off: The computer is off or in Hibernation.
(6) Wireless light ● White: An integrated wireless device, such as a wireless local
area network (WLAN) device and/or a Bluetooth® device, is
on.
● Amber: All wireless devices are off.
Buttons, speakers, switches, and fingerprint reader (select models only)
NOTE: Your computer may look slightly different from the illustration in this section.
Component Description
(1) Speakers (2) Produce sound.
(2) Internal display switch Turns off the display if the display is closed while the power is on.
Identifying hardware 3