With a print resolution of up to 600 x 600 x 4 dpi the Xerox Phaser 6000 delivers an excellent 16 shades of colour per pixel. This makes a wider colour range possible for more impressive business graphics. Although the Xerox Phaser 6000 colour LED printer does not have a duplex unit it's possible to print double sided manually. A4 Colour LED Printer 10ppm Colour Print Speed 12ppm Mono Print Speed 600x 600x 4 dpi Resolution 64MB Memory 150 Sheet Input Tray USB (Universal Serial Bus) Duplex