Oki MB461/471/491 Toner Cartridge Black. OEM: 44574802 Keep your OKI MB-series multifunction printer running for longer before cartridge replacement by installing a genuine OKI Black High Yield Toner Cartridge (44574802). The red Attention light on your printer will illuminate when the current cartridge is running low and you'll see a "Toner Low" message on the display. Order a new cartridge as soon as possible and install it when you see the "Toner Empty" message. This standard yield toner cartridge is packed with enough black toner to print 7,000 pages.