product : epson gt-s50 scanner type : sheetfed, one pass duplex a4 colour scanner optical resolution : 600 x 600 dpi output resolution : 75, 100, 150, 200, 240, 300, 400 & 600dpi scanning method : sheet through, duplex scanning paper supply: face down load paper out: face down eject photoelectric device : 3 lines colour ccd light source : white led scanning speed (a4, 200dpi): mono/col: simplex 25ppm, duplex 50ipm max eff scan area: document size : plastic card (in portrait scanning only), a4, a5, a6, b5, business card, letter, legal and custom sizes (can set for up to 5 different paper types), a3 and b4 size supported with carrier sheet max size: 216 x 914.4 mm ; min size: 53.5 x 73.7 mm input tray capacity :75 sheets (based on 75g/m2 paper) paper weight auto: 50-130g/m2 , manual: 45-200g/m2 pixel depth : in: 16 bits / pixel , out: 1, 8 bits / pixel colour : 24 bits external interface : usb2.0 (type-b standard connector) x 1 supp platforms : usb2.0 high-speed: ms win 2000 pro/xp (home ed/pro/ pro x64)/ windows vista mac os x 10.3.9 +