HP (Hewlett Packard) LaserJet Enterprise 500 Color M551n (CF081A) is a reliable and robust workgroup color laser printer designed to meet the most demanding printing needs. M551n prints up to 32 ppm with high resolution 1200 x 1200 dpi. Enterprise M551n comes with 600-sheet standard media input capacity which can be upgraded to 1100 sheets capacity. It also has 250 sheets capacity output tray. M551n comes with both USB and ethernet connection and includes enterprise networking capabilities. HP Color LaserJet M551n uses HP (Hewlett Packard) 507A Black, 507X High Yield Black and three 507A Color (Cyan, Yellow, Magenta) cartridges. Cartridge model numbers are CE400A, CE400X, CE401A, CE402A, CE403A, CE254A.