Replaces Lexmark MS810N/ MS817N 55 ppm, 1200x1200 dpi USB, Ethernet, Duplex not available Dual Core, 1000MHz, 512MB Memory Monthly Duty Cycle: Up to 250000 pages per month 11,000 pages Starter Return Program Toner Cartridge Compatible Toner Cartridges: 58D1000, 58D1H00