The Lexmark MX331adn is a monochrome laser printer designed for small workgroups with features including duplex printing, integrated duplexing for two-sided printing, print speeds up to 40ppm, and a recommended monthly page volume of 500 to 5000 pages. 

It has a 2.8 inch LCD touch panel display, integrated networking capabilities via Ethernet, and supports direct USB connectivity. 

Additional capabilities of the MX331adn include automatic document feeding, monochrome copying and scanning, fax functionality, and security features to help protect information. 

The printer is compact in size at 13.3 x 16.2 x 14.4 inches and lightweight at 28.2 pounds. It utilizes high yield Unison toner cartridges for up to 15,000 pages and has a maximum monthly duty cycle of 50,000 pages. 

The MX331adn meets EPEAT Silver and ENERGY STAR guidelines for reduced environmental impact.