HP ProBook 645 G1 Notebook PC - Manual (Page 26)

Bottom
Component Description
(1) Service door Provides access to the hard drive bay, the wireless
LAN (WLAN) module slot, the WWAN module slot,
and the memory module slots.
CAUTION: To prevent an unresponsive system,
replace the wireless module only with a wireless
module authorized for use in the computer by the
governmental agency that regulates wireless devices
in your country or region. If you replace the module
and then receive a warning message, remove the
module to restore computer functionality, and then
contact support through HP Support Assistant. To
access HP Support Assistant on the Start screen,
select the HP Support Assistant app.
(2) Battery release latch Releases the battery.
(3) SIM slot Supports a wireless subscriber identity module (SIM)
(select models only). The SIM slot is located inside the
battery bay.
(4) Docking connector Connects an optional docking device.
(5) Service door release lock Locks the service door.
16 Chapter 2 Getting to know your computer