Premium C540H1MG High Yield Magenata Toner fully compatible with the Lexmark C540, C540N, C543, C543DN, C544, C544DN, C544DTN, C544DW, C544N, C546, C546DTN, X543, X543DN, X544DN, X544DTN, X544DW, X544N, X546, X546DTN, X548, X548DE, X548DTE . The use of compatible supplies does not void your printer warranty.