LD Compatible Toner Cartridge Replacement for Dell 593-BBOW N7DWF (Black, 3-Pack) Page Yield: 3,000 per cartridge | Shelf Life: 24-36 months per cartridge The use of compatible cartridges and supplies does not void your printers warranty All LD branded products are backed by a 100% satisfaction and LIFETIME guarantee These compatible cartridges each contain a toner management computer chip system which allows the cartridge to communicate more effectively with your computer For use in the following Dell Laser Printers: H625cdw, H825cdw, S2825cdn