Lexmark MS331dn monochrome laser. Prints upto 40/38 pages per minute, and features intergated Duplex or 2-sided printing. 550 sheet paper tray. Uses 55b1000 or 55b1h00 toners. General Information Manufacturer:Lexmark International, IncManufacturer Part Number:29S0000Manufacturer Website Address:http://www.lexmark.comBrand Name:LexmarkProduct Model:MS331DNProduct Name:MS331DN Laser PrinterPackaged Quantity:1 EachProduct Type:Laser Printer Technical Information Recommended Use:Plain Paper PrintPrint Color Capability:MonochromeMaximum Mono Print Speed (ppm):40Maximum Print Resolution (dpi):2400Duplex Printing:AutomaticPrint Technology:Laser Processor & Chipset Processor Speed:1 GHz Memory Standard Memory:256 MB Interfaces/Ports USB:Yes Network & Communication Ethernet:Yes Media Types & Handling Number of Input/Multipurpose Trays Installed:1Standard Input Media Capacity:100 Sheets Power Description Power Source:AC Supply Physical Characteristics Form Factor:Desktop Product Numbers: 29S0000 734646695527 LEX69552 805558 LEX29S0000