DESC: Simply use the 35-sheet automatic document feeder (ADF) or letter sized platen glass to print on both sides of a single sheet of paper. This compact desktop design also incorporates Canon''s Single Cartridge System—The easy-to-replace cartridge that simplifies maintenance by combining the toner, drum and other moving parts into one unit resulting in excellent image quality retention and eliminating the complication of purchasing or storing separate toner and drum consumables.