LD Remanufactured Ink Cartridge Replacement for HP 934XL C2P23AN High Yield (Black, 2-Pack) Page Yield: 1,000* per cartridge | Shelf Life: 12-18 months per cartridge | *Average cartridge page yield in accordance with ISO IEC 24711 The use of remanufactured cartridges and supplies does not void your printers warranty All LD branded products are backed by a 100% satisfaction and LIFETIME guarantee These remanufactured cartridges come equipped with an ink indicator chip that accurately tracks your ink levels and communicates with your printer to be sure you are receiving the best quality print possible For use in the following HP Officejet, and Officejet Pro printers: 6812, 6815, 6230, 6830, and 6835