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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.