Original HP Q7551X (51X)

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 ¹The product version determines when it has undergone its last revision and upgrade. Today's printers, when connecting to computers, tablets or any mobile device, have the ability (often without your knowledge) to change some of the printer's internal settings. This automatic printer leveling technology has been developed by OEMs to counteract recycled or compatible cartridges. It's important to make sure you always have the latest version cartridges; otherwise it could significantly affect cartridge performance.

²The generation determines the components used for the manufacturing of the compatible cartridge or the recycling of the original cartridge. (HD) High Definition, (EHQ) Economical High Quality, (EP) Which can be translated as ... Manufactured to be sold for the price, regardless of performance.

³ Manufacturers of compatible & recycled cartridges have the choice to use inks & toners with different components. A wrong choice can directly affect the yield (30 to 60% fewer copies) per cartridge and cause premature wear on your equipment.

⁴ The number of 81/2 X 11 pages that can be printed from this 5% coverage cartridge. Monochrome Toner Standard (ISO / IEC 24711) Color Toner (ISO / IEC 19798)