HP LaserJet 3390 All-in-One Printer(Q6500A) : HP LaserJet 3390 All-in-One Printer - Print: Up to 22 ppm Letter/ 21 ppm A4 black; Up to 1200 x 1200 dpi; Up to 10,000 pages per month duty cycle; Scan: Up to 19,200 dpi enhanced & up to 1200 dpi optical; Copy: Enlarge/reduce 25 to 400%; Fax: 3 seconds per page, up to 250, up to 120 (119 group dials); Hi-Speed USB 2.0 port, 10/100 Base-T wired Ethernet network port, RJ-11 fax port, RJ-11 line-out telephone port // HP LaserJet 3392 All-in-One Printer(Q6501A) : HP LaserJet 3392 All-in-One Printer - Print: Up to 22 ppm Letter / 21 ppm A4 black; Up to 1200 x 1200 dpi; Up to 10,000 pages per month duty cycle; Scan: Up to 19,200 dpi enhanced & up to 1200 dpi optical; Copy: Enlarge/reduce 25 to 400%; Fax: 3 seconds per page, up to 250, up to 120 (119 group dials); Built-in 10/100 wired Ethernet network connectivity with 1 RJ-45 port; Hi-Speed USB 2.0 port, 10/100 Base-T wired Ethernet network port, RJ-11 fax port, RJ-11 line-out telephone port //