Green Toner Supply&trade; Compatible Ink Cartridge Replacement for HP 940XL (Black) Green Toner Supply offers LIFETIME WARRANTY against manufacture defects Green Toner Supply offers 2 Years Money Back Guarantee on Manufacture Defects Print Yield: Up to 2,200 Pages at 5% Coverage Green Toner Supply Compatible Ink Cartridge Replacement for HP 940XL works with the following machines: HP Officejet Pro 8000 Wireless Printer - A809n, HP Officejet Pro 8500 Wireless All-in-One Printer - A909g, HP Officejet Pro 8500 Premier All-in-One Printer Green Toner Supply cartridges were professionally manufactured in an ISO 9002 factory