Scanner Ricoh SP-1425Scanner Type: ADF (Automatic Document Feeder) / Flatbed, DuplexScanning Speed (A4 Portrait), (Color/Grayscale/Monochrome) ADF: Simplex: 25 ppm (200/300 dpi), Duplex: 50 ipm (200/300 dpi) Flatbed: 4 seconds (200/300 dpi)Image Sensor Type: Single line CMOS-CIS x 2 (front / flatbed x 1, back x 1)Light Source: 3 Color LED x 2 (front / flatbed x 1, back x 1)Optical Resolution: 600 dpiOutput Resolution: (Color / Grayscale / Monochrome) : 50 to 600 dpi (adjustable by 1 dpi increments), 1,200 dpi (driver)Output Format: Color: 24-bit, Grayscale: 8-bit, Monochrome: 1-bitBackground Colors: : ADF: White, Flatbed: BlackDocument Size (ADF) Maximum: 216 x 356 mm (8.5 x 14 in.) Minimum: 114 x 140 mm (4.5 x 5.5 in.) Long Page Scanning: 3,048 mm (120 in.)Document Size (Flatbed): Maximum 216 x 297 mm (8.5 x 11.7 in.)Paper Weight (Thickness): 52 to 127 g/m2 (14 to 34 lb)ADF Capacity: 50 sheets (A4 80 g/m2 or Letter 20 lb)Expected Daily Volume: 4,000 sheetsMultifeed Detection : Overlap detection (Ultrasonic sensor)Interface: USB 2.0 / USB 1.1