Install a genuine OKI Black High Yield Toner Cartridge (43979202) and print even more pages from your OKI B430/B440 laser printer before cartridge replacement. After you see the Toner Low message on your OKI printer, you'll only be able to print about 100 more pages. Install a new cartridge as soon as possible when you see the Toner Empty message. This high capacity cartridge contains extra toner for a yield of up to 7,000 pages.