With even more toner, a genuine OKI Black High Yield Toner Cartridge (44992402) installed in your OKI laser printer ensures high quality print output and great reliability. When you see a Toner Low message on your printer's display, make sure to order a replacement cartridge as soon as possible. Install it when you see Toner Empty displayed on the screen and continue printing straight away. This high capacity cartridge contains extra toner for a yield of up to 2,500 pages and is designed for B401, MB441 and MB451 printers.