This Inkalfa black toner cartridge is a compatible choice for HP LaserJet Pro 4001n/dn/dw printers. It comes with a chip and is designed for laser print technology. The cartridge is sold in a pack of 2 and has a print yield of up to 18,000 pages. The manufacturer offers a 3-year warranty for this product, which is perfect for businesses that need reliable and high-quality printing. The cartridge is easy to install and ensures sharp and clear text. It is a great choice for those who need to print documents or presentations with professional-quality printing.