HP LaserJet Pro M521DN 42 ppm duplex Ethernet monochrome laser printer

Monochrome multifunction with 42 ppm output

The HP LaserJet Pro M521DN is a monochrome laser multifunction that prints, copies, scans and faxes at up to 42 pages per minute. It produces black output at 1200 x 1200 dpi and handles automatic two-sided printing. A 50-sheet automatic document feeder streamlines multi-page scan, copy and fax jobs. First pages arrive in roughly eight seconds.

Ethernet connectivity and 650-sheet capacity

The printer connects to a network through its RJ-45 Ethernet port and supports AirPrint for direct mobile output. Two paper trays combine for a maximum input of 650 sheets, reducing reload frequency in shared-office environments. Duplex printing is built in, so double-sided documents run without manual intervention. Fax transmission runs at 33.6 kbps, taking about six seconds per page.

High-volume monochrome workloads

This device is aimed at workgroups that need fast, reliable black-only output and network sharing without wireless complexity. The 650-sheet capacity and 42 ppm engine handle daily print runs that would overwhelm smaller desktop units. Buyers who require colour printing, Wi-Fi direct connectivity or larger paper formats will need a different product class.