HP Laptop User Manual page 24

Component
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14 Chapter 2 Getting to know your computer
Description
Service door release latch
Service door release lock
Vents (3)
SIM slot (select models only)
Releases the service door on the computer.
Locks the service door.
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.