<P> By using system components manufactured by Hewlett-Packard, you are assured a higher level of reliability and are less likely to experience compatibility problems. Hewlett-Packard testing is among the most rigorous in the industry so you can be confident that you re receiving the highest quality and dependability. This is a 16MB SIMM memory module for the HP LaserJet 4 & 5 series of printers. This module will support the following LaserJet models: 4P, 4MP, 4 Plus, 4M Plus, 4V, 4MV, 5P, 5MP, 5SI, 5SIMX. It also supports the Color LaserJet series of printers. </P>