Document scanner a3 scanner feeder scanner scan technologies cmos cis scan format a3 supported document size 305 x 3000 mm scan resolution 600 dpi interface usb 20 max scan speed 130 pagesmin automatic document feed 500 sheets weight of paper 20 255 gm document feeder automatic colour depth 24 bit light source led tri colour rgb functions duplex scanning ultrasonic double feed detection prescan controls scan buttons compatible operating sys