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PC Card eject switch
Slide to eject the inserted PC Card.
Battery replacement switch
For replacing main batteries as well as the backup battery.
Main battery holder (HC-4000/HC-4100)
Holds two AA (LR6) alkaline batteries, or can be replaced with the optional Ni-MH
Rechargeable Battery Pack.
Ni-MH Rechargeable Battery Pack (HC-4500)
Infrared port
For wireless communication with other handheld PCs, SHARP ZR series unit and
infrared-capable notebook and desktop PCs, and printing to infrared-capable
printers.
DC power jack
For connecting to the AC adaptor included in HC-4500 package or the optional
Docking Station Kit.
Serial port
For connecting to a desktop PC for data transfer or to a printer for printing.
Memory module cover
Open to replace the Memory module, if necessary.
Speaker
Backup battery cover
Open to replace the backup battery.