The HP LaserJet 1100a monochrome laser printer prints at 600 dots per inch (dpi) with HP Image REt (Resolution Enhancement technology). It features EconoMode to save toner and has duplex-printing features that print on both sides to save paper. It also prints multiple pages on a single-sheet of paper to save paper. It also protect your documents by using Watermarks such as �?confidential�� and includes Print Books which enables you to easily print the pages required to create cards or books.