Return Program toner cartridge is essential to Lexmark Print System performance. Unison toner consistently delivers outstanding image quality, ensures long-life system reliability & promotes superior sustainability – all in an innovative, shake-free print system. Cartridge is compatible with Lexmark B3442dw & MB3442adw. Genuine Lexmark supplies are engineered to work best together with your Lexmark printer, delivering excellent print quality from the first page to the last. Return Program toner cartridge is a patented device that is sold at a special price subject to the restriction that the cartridge may be used only once. Following the initial use, return the cartridge only to Lexmark for remanufacture & / or recycling. Perfect for high-volume printing, extra high-yield cartridge maximizes your savings & yields approximately 6,000 pages.