Oki proColor pro910 Series User Manual page 13

Additionally, the following features are available:
> Automatic two-sided (duplex) printing for economical use of
paper and compact printing of larger document
> Hard disk drive enables spooled and verified printing
NOTE
This is an optional feature on the pro910 model and is standard on
the pro930.
> Additional paper trays for loading a further 530 sheets at a
time to minimize operator intervention, or different paper
stocks for letterhead stationery, alternative paper sizes or
other print media:
• 2nd/3rd Tray (530 sheets each)
• High Capacity Feeder (HCF) (1590 sheets)
NOTE
Tray configurations are: Tray 1 only, Tray 1 + 2nd Tray, Tray 1 +
2nd Tray + 3rd Tray, Tray 1 + HCF, Tray1 + 2nd Tray + HCF
> Additional memory
> Finisher (for stapling printer output)
> Punch unit (to extend Finisher functionality)
pro910 User's Guide> 13