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