HP LaserJet Enterprise M611dn Duplex Network Laser Printer, Key SpecificationsPrint Speed: Up to 65 pages per minute (ppm)Print Resolution: Up to 1200 x 1200 dpiPaper Capacity: 650 sheets standard (100-sheet multipurpose tray and 550-sheet input tray 2)Duplex Printing: Automatic, double-sided printing standardMonthly Duty Cycle: Up to 275,000 pagesSecurity: HP Sure Start real-time intrusion detection and self-healing BIOSLocal