HP Laserjet Pro M451dn Color Printer (Discontinued By Manufacturer) Print Speed1: Up to 21 ppm black (letter), Up to 21 ppm color (letter) Print Resolution: Up to 600 x 600 dpi Print Technology Resolution: HP ImageREt 3600 Monthly Volume (Duty Cycle): Up to 40,000 pages Use only Original HP Toner in your HP printer for great results, print after print