The Lexmark MS821dn features performance & savings with a first page as fast as 4.5 seconds, output up to 55 pages per minute, & two-sided printing. Its robust paper handling includes reliable feeding of a wide range of media types & sizes, up to 4,400 sheets of input & optional finishing. Plus, its long-life imaging unit & fuser reduce downtime. And whether you connect via Ethernet, USB or simple mobile printing options, Lexmark-exclusive full-spectrum security helps protect your device, your network & your best ideas. Maximum Print Speed (Black): 55 ppm; Print Resolution (Black) (Width x Height): 1200 x 1200 dpi.