Black & White Laser Printer Duplex (2-sided) Printing: Not Available Print Speed: Up to 52 ppm Recommended Monthly Page Volume: 3000 - 50000 Pages Fast start + enduring performanceA first page as fast as 4.5 seconds sets the stage for printing and copying up to 55 [52] ppm*. And support for large workloads is built in, with recommended monthly page volume as high as 350,000 pages.Meet the futureA combination of 1-GHz dual-core processor and 512 MB of memory (upgradeable to 4.5 GB) has the power to handle demanding tasks right now while providing a secure, upgradeable framework for future advances in product functionality. And all two-sided-printing models in Lexmarks most energy-efficient line of large-workgroup monochrome products ever are rated EPEAT® Silver and ENERGY STAR® (2.0) certified.Interact with easeWith new front power button and USB port, 2.4-inch colour LCD/keypad to monitor and configure system settings and single-door access to parts and supplies, its easier than ever