Lexmark Mono Laser Printer MS431dn with output up to 42  pages per minute* and a light, compact form factor, the Lexmark MS431dn provides fast, dependable performance. Connect via USB or Gigabit Ethernet and power through big jobs with a 1-GHz multi-core processor, 256 MB of memory and a 100- sheet multipurpose feeder. Available Extra High Yield Unison toner prints up to 20,000 pages, and optional 550-sheet tray supports longer print runs and enhances media flexibility. A steel frame drives durability and long-life reliability, while standard two-sided printing saves paper, the lifetime fuser minimizes maintenance, and Lexmark full-spectrum security helps protect your network and proprietary information. Print Resolution (Default) 600x600; Print Resolution (Max) 2400 Image Quality.