Authentic Lexmark Return Program toner for printers:

• Lexmark Laser Printer CS 317, 317dn, 417, 417dn, 517, 517de, 517dn
• Lexmark Laser Printer CX 317, 317dn, 417, 417de, 417dn, 517, 517de, 517dn

The toner cartridges included in Lexmark's return program are discounted printing toner cartridges, in exchange for the customer agreeing to the condition that the cartridges will be used only once and returned only to Lexmark for remanufacturing or recycling. These single-use toner cartridges stop functioning when they reach the end of their rated life, as determined by Lexmark (a variable amount of toner may remain in the cartridge when replacement is required). These toner cartridges can also automatically update the printer's memory to protect it from counterfeit and unauthorized products.