High-quality, Return Program imaging unit is essential to Lexmark print system performance. Imaging unit is designed to work best with Unison toner to perform in an innovative, shake-free print system. 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. Device Types: Multifunction Laser Printer; Color(s): Black; Supply Type: Drum Unit; OEM/Compatible: OEM.