The HP LaserJet P3000 series is a series of black & white laser business printers. Unveiled in October 2006, they are a direct replacement for the LaserJet 2400 series of printers.
HP LaserJet P3000 series Wikipedia
The HP LaserJet P3000 series consists of the following models:P3005 (Q7812A)
The letters at the end of the model have the following meaning:d – this model comes with an automatic duplexer
n – this model comes with an internal 10/100 BASE-T JetDirect card
dn – this model comes with all the above
x – this model comes with all the above plus an additional 500-sheet input tray