LD Compatible Toner Cartridge Replacements for HP 78A CE278A (Black, 3-Pack) 100% Satisfaction & LIFETIME Guarantee Fast shipping and award-winning customer service For use in HP LaserJet / LaserJet Pro M1536dnf, M1537dnf, M1538dnf, M1539dnf, P1566 & P1606dn The use of compatible replacement toner cartridges and supplies does not void your printers warranty Page Yield Per Cartridge: 2,100* | Shelf Life: 24-36 Months | *Average cartridge page yield in accordance with ISO IEC 24711