Plustek SmartOffice PN2040. Maximum scan size: 216 x 297 mm, Scanner type: Flatbed, Optical scanning resolution: 600 x 600 DPI. Auto document feeder (ADF) input capacity: 50 sheets. Scanning media types supported: Card stock, Plain paper, Maximum scan area (ADF): 216 x 356 mm, Minimum scan area (ADF): 13.2 x 13.2 mm. Standard interfaces: USB 2.0. Scan drivers: TWAIN