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. Maximum Print Speed (Black): 42 ppm; Print Resolution (Black) (Width x Height): 600 x 600 dpi; B&W or Color Output: B&W; Printer Type: Laser.