Network-ready laser printer delivers professional-quality documents speed and color to boost productivity and save time with print speeds up to 21 pages per minute with up to 600 dpi. First page is out in 17 seconds. Use HP ImageREt 3600 and Original HP LaserJet toner cartridges to produce bold text and smooth color. Produce color marketing materials in-house on a range of media sizes by using tips and templates from HP. Conserve resources and save paper, using automatic two-sided printing. Share printing resources, using built-in Ethernet. Standard connectivity includes one Hi-Speed USB 2.0 port and one Fast Ethernet 10/100Base-TXnetwork port. Proactively manage office printing with HP Web Jetadmin. LaserJet Enterprise 400 Color M451DN Printer also features mobile printing capability, maximum printing size of 8-1/2" x 14", 128MB memory, 600MHz processor, 50-sheet multipurpose tray and 250-sheet input tray. Energy Star qualified.