Install a genuine OKI Black Laser Toner Cartridge (43502302) in your OKI B4400 or B4600 monochrome laser printer and enjoy crisp prints with great reliability. You'll see a Toner Low error message on your OKI printer's display when the current cartridge is running out. Make sure you order a replacement and install it when you see the Toner Empty or Change Toner message. This standard yield toner cartridge is packed with enough black toner to print 3,000 pages.