Plustek SmartOffice PL 2550. Maximum scan size: 216 x 356 mm, Scanner type: Flatbed, Optical scanning resolution: 600 x 600 DPI. Standard input capacity: 50 sheets, Auto document feeder (ADF) input capacity: 20 sheets. Scanning media types supported: Plain paper, Card stock, Maximum scan area (ADF): 216 x 356 mm, Minimum scan area (ADF): 13.2 x 13.2 mm. Standard interfaces: USB 2.0, Optional connectivity: USB. Scan drivers: TWAIN