Compatible with: HP LaserJet: 2420, 2420d, 2420dn, 2420n, 2430, 2430dtn, 2430n, 2430tn This is the Compatible Higher Yield Version of HP 11A Q6511A Black Professionally manufactured by LD Products Page Yield* Per Cartridge: 12,000* For best results, store in a cool, dry place. Use within 3 years of purchase for optimal performance. *Average cartridge Page Yield at 5% coverage in accordance with ISO IEC 24711