HP EliteBook 840 G2 Notebook PC Maintenance And Service Manual page 35

Item Component
(5) Vents (2)
(6) SIM slot (select models only)
ENWW
Description
Enable 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.
Supports a wireless subscriber identity module (SIM). The
SIM slot is located inside the battery bay.
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