The HP LaserJet Pro M404dn is a monochrome (black and white) laser printer designed for efficient, high-quality printing in office environments. It's a single-function printer, meaning it only handles printing tasks, not scanning, copying, or faxing. Key features include automatic duplex (double-sided) printing, a fast print speed of up to 40 ppm (pages per minute), and a high monthly duty cycle of 80,000 pages. It connects via USB and Ethernet, and supports mobile printing through various platforms like Apple AirPrint and Google Cloud Print.