FEATURES- Replacement Toner Cartridge- Black
       for use with HL2700CN, MFC9420CN
       The Black toner cartridge has an up to 10,000 pages yield and the 
        color toner cartridges have up to 6,600 page yield based on 
        approximately 5% coverage for each color used when printing on 
        A4/Letter sized paper.
       When one of the LCD panel squares starts to flash, this indicates
        that one of the toner cartridges is running low on toner. When
        this happens, you should order the appropriate replacement toner
        from your Brother reseller as soon as possible. 
       When you see "TONER EMPTY" message on the LCD panel, the printer
        stops printing until you replace the toner cartridge which has
        run out

BLACK TONER CARTRIDGE FOR USE WITH THE BROTHER HL2700CN