Its Dual Function Panel provides streamlined controls and function buttons that transform into a keypad while in fax mode for easier operation. A built-in, fully integrated 35-sheet Duplex Auto Document Feeder means fast copying scanning and faxing of your originals so you can multi-task while the printer is at work. To increase home office efficiency and productivity, Built-in Auto Duplex Printing prints 2-sided documents without having to manually flip the pages.