Compatible with: HP DeskJet: 810, 810C, 812, 812C HP PSC: 500PSC, 500xi The following Compatible Cartridges are Included: 3 HP 15 C6615DN Black 2 HP 23 C1823D Tri-Color Professionally remanufactured by LD Products Page Yield* Per Cartridge: Black - 840* Color - 690* For best results, store in a cool, dry place. Use within 18 months of purchase for optimal performance. *Average cartridge Page Yield at 5% coverage in accordance with ISO IEC 24711 Please contact us first with any product issues. We want all of our customers to be happy because happiness matters.