Compatible OKI B4520/B4540 Black Toner. This toner lasts for 6,000 pages — the same as the original. The compatible toner does not affect the printer warranty and the print quality is the same. The toner is ready to use; it does not require any handling (it includes a chip).
Compatible OKI B4520/B4540 HC Black Toner. This toner lasts for 12,000 pages — the same as the original. This toner does not require any previous handling and includes a chip. Just insert it and start printing! Neither does the toner damage the printer nor invalidate the warranty.