HP 640 Fax Machine. Be more productive with automatic redial, 50 sheet paper tray, 100 speed dials, 10 one touch dials, and management reporting. Simple to use and efficient with one touch buttons and easy to understand menus for quick access to reports, system set up and tools. Get HP reliability, 6 second per page fax performance, and crisp black output at low cost using plain paper. Save desktop space with small footprint and compact, dual tone styling that blends into any environment.