The Lexmark T644dtn printer has a 514 MHz processor, 128MB of memory, duplex unit, a fast print speed of up to 50 ppm with a time to first page as fast as 8.5 seconds and a USB Direct flash drive for PDF printing. It works with 16 to 47 lb plain paper and up to 110 lb card stock as well as paper labels, dual-web labels, polyester labels, vinyl labels, transparencies, envelopes and more. The Lexmark T644dtn printer works on Windows, Linux, UNIX, Mac, NetWare and OS/400, has a 1,100-sheet input and can print up to 250,000 pages per month.