Brother FAX4100E IntelliFax Plain Paper Laser Fax/Copier Black-and-white laser fax machine also copies and prints. Operating Environment: Temperature 50-90.5 degrees Fahrenheit Fax transmission speeds up to 3 seconds per page.High speed 33.6K bps superG3 fax modem 600 x 600 DPI resolution for faxes, copies, and prints Auto-dial up to 132 numbers 250-Sheet paper tray and 30-sheet automatic document feeder