HP ProBook 450 G3 Maintenance And Service Manual page 26

Component
(3)
(4)
(5)
(6)
(7)
14 Chapter 2 External component identification
Battery bay
Battery release latch
Vents (3)
Service door
SIM card slot
Description
Holds the battery.
Releases the battery.
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.
Provides access to the hard drive bay and the memory
module slots.
Supports a wireless subscriber identity module (SIM) card.
The SIM card slot is located inside the service door.