Lexmark C540H2KG High Capacity Black Toner Cartridge For use in Lexmark C540DW, C540n, C543dn, C544dn and C544dtn Works with C544DW, C544n, C546dtn, X543DN, X544DN and x544dtn Compatible with X544DW, X544N, x546dtn, x548de and x548dte