PHOTOCONDUCTOR UNIT THIS PHOTOCONDUCTOR UNIT IS DESIGNED TO WORK BEST WITH UNISON TONER. ESSENTIAL TO LEXMARK PRINT SYSTEM PERFORMANCE, UNISON TONERS 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. VALUE TAKE A GIANT LEAP IN LONGEVITY. STANDOUT PERFORMANCE AND MAXIMUM YIELD FOR A TRUE INVESTMENT IN EFFICIENCY AND YOUR PROFESSIONAL FUTURE.