HP EliteBook Revolve 810 G1 Tablet - Manual (Page 18)

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Component Description
(1) Vent Enables airflow to cool internal components.
NOTE: The computer fan starts up automatically to cool
internal components and prevent overheating. It is normal
for the internal fan to cycle on and off during routine
operation.
(2) Speaker Produces sound.
8 Chapter 2 Getting to know your computer