Page Yield* Per Color Cartridge: 2,500 For best results, store in a cool, dry place. Use within 3 years of purchase for optimal performance.*at 5% coverage (ISO/IEC standard) All of our replacement toner cartridges are compatible with Dell laser printers and contain a toner management computer chip system that works with Dell Printers**, which helps the cartridge communicate more effectively with your computer. Compatible with the following printers: Color Laser 2130cn & 2135cn Please contact us first with any product issues. We want all of our customers to be happy because happiness matters.