The HP 58D79A is a 250-sheet paper tray with stand for HP LaserJet A3 multifunction printers including the M442dn, M443nda, M438, M439, M440 and M437 series and the M42523, M42525, M42623 and M42625 models. It adds an extra paper source so the printer can hold another paper size or run longer between refills, and the stand raises the MFP to a comfortable working height while giving it a stable base on the floor. It is a practical upgrade for shared office printers that handle A3 and A4. The unit measures about 653 x 711 x 655 mm and weighs about 22.3 kg. It is a genuine HP accessory. Check your printer model against the list above before ordering. After comparing online prices, www.marvel.co.za should be the cheapest on this product.