LD Compatible Toner Cartridge Replacement for Dell E525w (Black, Cyan, Magenta, Yellow, 4-Pack) 100% Satisfaction & Lifetime Guarantee For use in Dell Multi-Function E525w Fast shipping & award-winning customer service Black Page Yield: 2,000 | Color Page Yield: 1,400 | Shelf Life: 24-36 Months Each cartridge contains a toner management chip system which helps the cartridge communicate more effectively with your computer