HP Color LaserJet CM4730 Multifunction Printer series - Manual (Page 313)

Optional output devices
1 Output accessory bridge
2 Stapler/stacker
3 3-bin mailbox
Output accessory bridge
The output accessory bridge is required if a 3-bin mailbox or a stapler/stacker is installed on the MFP.
The output accessory bridge is a pathway between the MFP and the output device. For more information
about installing the output accessory bridge, see the installation guide that comes with the product.
3-bin mailbox
The optional 3-bin mailbox has one bin that stacks up to 500 sheets and two bins that stack up to
100 sheets each, for a total capacity of 700 sheets.
ENWW Optional output devices 297