Compatible with the Following Printers ● HP Officejet 4500 All-in-One Printer ● HP Officejet 4500 Desktop All-in-One Printer ● HP Officejet 4500 Wireless All-in-One Printer ● HP Officejet J4580 All-in-One Printer ● HP Officejet J4680 All-in-One Printer Product Features Quality: Easy to Install. Smooth printing without clogging. Clear printing quality and vivid color. 100% Compatibility: Adopting the lastest smart chips. Shows accurate ink level. Printer Recognition without problems. Cost Effective: Great value OfficeWorld 364XL ink cartridges with reasonable price for daily use such as school, work, and home printing. Safe Package: The new mould uses different design with better sealing property. Never worry about the leakage on your hands, desk and carpet. Instructions Guide Please remove the protecting cover for this 901XL ink cartridges before using, then tear off the plastic tape. If printer tells you "Not recognized ink cartridges", please clean the smart chips of the cartridges with a rubber eraser or cotton swab and install the ink cartridges again. Please do not touch the smart chips of the ink cartridges with hands. If the 901XL ink cartridges are unable to be recognized, please try to remove the ink cartridges, and install it for several times. If the print quality is not good, please run the nozzle cleaning to get a better result. If the printer occurs an error message that "Cartridges are empty", please give the ink cartridges a gentle shake and install it again. If the troubleshootings above still do not help, please try to contact us via the steps below. We will replace a new pack to you responsibly.