For continued, high quality printing with your Kyocera FS-1030D laser printer, install a genuine Kyocera Black Laser Toner Kit (TK120). The toner light on your printer will flash red when the toner is running low, letting you know it's time to order a fresh toner cartridge. When you see a solid red light, it's time to swap the old cartridge for the new one. This high yield cartridge contains even more toner for printing up to 7,200 pages.