Sharp MX-FX15 Fax Expansion Kit is used for the Sharp MX-M3070, MX-M3570, MX-M4070, MX-M5070, MX-M6070, MX-3070V, MX-3570V, MX-4070V, MX-5070V, MX-6070V, MX-M2651, MX-M3051, MX-M3551, MX-M4051, MX-M5051, MX-M6051 copiers. Sharp brand supplies works best for your Sharp copiers or printers and make using fax expansion kit make them last longer.