Developer unit is designed for use in your Lexmark C540dw C540n C543dn C544dn C544dtn C544dw C544n C546dtn X543dn X544dn X544dtn X544dw X544n X546dtn X548de and X548dte. Superior Lexmark design means precision pairing between printer and cartridge for value quality and environmental responsibility you can count on. Unit yields up to 30000 pages based on approximately 5 percent coverage per color at factory default settings.