product description : canon document scanner type : colour flatbed scanner scanning element : cis (contact image sensor) light source : rgb three-colour led resolution : 4800 x 4800 dpi optical 19,200 interpolated scanning gradation : colour : 48-bit input/48 or 24-bit output grayscale : 16-bit input/8-bit output maximum size : a4/ltr, 216 x 297 mm preview speed : approx. 9 sec scanning speed : colour: 8.7msec/line (1200dpi), 17 msec/line (2400dpi) grayscale, b&w : 2.9 msec/line (1200dpi), 5.6 msec/line (2400dpi) interface : high speed usb 2.0 power supply : via usb power consumption : 2.5w (max), 1w (standby) dimension(h x w x l) : 40 x 250 x 364 mm weight : approx. 1.6kg