Double Sided Printing Unit (Duplex) Yes Double Sided Printing Automatic Double Sided Printing Printer Resolution Up to 600 x 600 dpi Print First Page As Fast as 10.5 Seconds First page Product Group Output A4 Speed Colour Up to 21ppm Colour Print Speed Monochrome Up to 21ppm Mono Print System Specification Processor 800MHz Processor Memory (Maximum) 256MB DDR / 256MB Flash RAM Compatibility Operating Systems Supported Windows & Mac Compatible