Lexmark C544DN Duplex Colour Laser Printer. Maximum resolution: 1200 x 1200 DPI, Maximum duty cycle: 55.000 pages per month. Print speed (black, normal quality, A4/US Letter): 23 ppm, Print speed (colour, normal quality, A4/US Letter): 23, 25 ppm, Time to first page (black, normal): 11 s. Internal memory: 128 MB, Maximum internal memory: 640 MB. Processor clock speed: 500 MHz. Standard input capacity: 250 sheets, Maximum input capacity: 900 sheets