High-yield toner cartridge is designed for use with Lexmark T640, T640dn, T640dtn, T640n, T642, T642dtn, T642n, T642tn, T644, T644dtn, T644n, T644dtn and T644tn. Superior Lexmark design means precision pairing between printer and cartridge for value, quality and environmental responsibility you can count on. Choose Genuine Lexmark supplies for genuine Lexmark results. Nonrefillable cartridge is licensed for single use only. Lexmark Return Program Cartridges are sold at a special price, vs. the prices of regular cartridges, in exchange for the customer's agreement to use the cartridge only once and return it only to Lexmark for remanufacturing or recycling. Cartridge yields approximate 21,000 pages.