Lexmark Return Program CartridgesLexmark Return Program cartridges are print cartridges sold at a discount in exchange for the customer's agreement that the cartridges will be used only once and returned only to Lexmark for remanufacturing or recycling. These single-use only cartridges will stop working after reaching end of the rated life established by Lexmark (a variable amount of toner may remain when replacement is required). These cartridges may also automatically update the printer memory to protect the printer from counterfeit and unauthorized products. Supplies without this single-use term are available at www.lexmark.com.Lexmark Cartridge Collection ProgramGoing green has never been easier. Recycle all your used Lexmark supplies by letting us take care of the details. It's simple. smart and always free.Best TogetherGenuine Lexmark supplies are engineered to work Best Together with your Lexmark printer. delivering excellent print quality from the first page to the last.High YieldMaximize your savings and enjoy premium quality with Genuine Lexmark cartridges. High Yield cartridges offer a lower cost per page and contain more pages than Standard Yield cartridges do. Perfect for high volume printing.Unison™ TonerEssential to Lexmark print system performance. Unison™ Toner's unique formulation consistently delivers outstanding image quality. ensures long-life print system reliability and promotes superior sustainability -- all in an innovative shake-free print system.Compatible Printers: Lexmark MX 421 ade. Lexmark MS 421 dn. Lexmark MS 420 Series. Lexmark MS 421 dw. Lexmark MX 522 dhe. Lexmark MX 622 de. Lexmark MS 521 dn. Lexmark MS 520 Series. Lexmark MS 622 de. Lexmark MX 622 ade. Lexmark MX 521 de. Lexmark MX 522 adhe. Lexmark MS 621 dn. Lexmark MX 620 Series. Lexmark MX 522 adhs. Lexmark MX 520 Series. Lexmark MX 622 adhs. Lexmark MX 521 ade. Lexmark MX 622 adhe. Lexmark MS 620 Series