The Plustek SmartOffice PS 4080U is a departmental class document scanner capable of simplex/duplex scan. With built-in auto-document feeder, it is extremely efficient in performing duplex scan for a stack of double-sided documents. In simplex scan mode the Plustek PS4080U scans up to 40 pages per minute, and in duplex mode, 80 images. The auto-document feeder has a cavernous capacity of 100 sheets. All these features make the Plustek PS4080U scanner an essential part of every digital office.