Plustek MobileOffice AD450. Maximum scan size: 216 x 356 mm, Scanner type: Sheet-fed, Optical scanning resolution: 600 x 1200 DPI. Standard interfaces: USB 2.0. Weight: 1300 g. Minimum hard disk space: 800 MB, Minimum RAM: 256 MB, Minimum processor: 1 GHz. ISO A-series sizes (A0...A9): A4, A5, A6, ISO B-series sizes (B0...B9): B5, B6