HP LaserJet M4345 Multifunction Printer series - Manual (Page 19)

14 Output bin
15 Optional duplexer
16 On/off switch
17 Power connection
18 Interface ports
19 Formatter cover (provides access to the memory DIMM slot, hard disk, and analog-fax accessory)
Accessories and supplies
1 500-sheet feeder (Q5968A) (See the note that follows)
2 Duplexer (Q5969A)
3 Envelope feeder (Q2438B)
ENWW Walkaround 7