Installing a genuine OKI Black Toner Cartridge (44574702) ensures outstanding print output and unparalleled reliability from your OKI B411/B431 laser printer. The red Attention light on your printer will illuminate when toner is running low in the current cartridge 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 3,000 pages.