LD Compatible Toner Cartridge Replacement for Dell 593-BBJX DPV4T (Black) 100% Satisfaction & Lifetime Guarantee For use in Dell Multi-Function E525w Fast shipping & award-winning customer service Page Yield Per Cartridge: 2,000 | Shelf Life: 24-36 Months Each cartridge contains a toner management chip system which helps the cartridge communicate more effectively with your computer