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