HP LASERJET ENTERPRISE M611DN BLACK (A4, NORMAL): UP TO 61 PPM; BLACK (A4, DUPLEX): UP TO 50 PPM UP TO 275,000 PAGES (A4); RECOMMENDED MONTHLY PAGE VOLUME: 5,000 TO 25,000 PRINT ONLY. 6.9 CM LCD WITH KEYPAD. STANDARD 100-SHEET TRAY 1 AND 550-SHEET TRAY 2. AUTOMATIC DUPLEX. HP PCL 6, HP PCL 5 (HP PCL 5 DRIVER AVAILABLE FROM THE WEB ONLY), HP POSTSCRIPT LEVEL 3 EMULATION, NATIVE PDF PRINTING (V 1.7), APPLE AIRPRINT. HP EPRINT. BUILT IN NETWORK. WIRELESS IS OPTIONAL