Up to 25 ppm EPSON WorkForce DS-1630 Duplex USB Color Flatbed Scanner: SKU: CLOSE ALLTECHnology B11B239402 Type of Scanner: Flatbed Scanner Optical Resolution (ADF) 600 DPI x 600 DPI (horizontal x vertical resolution) 1,200 DPI x 1,200 DPI (horizontal x vertical) is the optical resolution. The maximum document size is 210 m.