Lexmark Mono Laser Printer MS431dw with output up to 42 [40] pages per minute and a light, compact form factor, the Lexmark MS431dw provides fast, dependable performance. Connect via USB, Ethernet, or standard Wi-Fi 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 paper tray supports longer print runs. A steel frame drives durability and long-life reliability, while standard two-sided printing saves paper, the lifetime fuser minimizes main