In the case of showing low warning, like the others cartridge, ink toner cartridge also gives outward indication of the low ink. You will find that there is low toner indicator in your cartridge to inform you about it. You can find a series of light flashing and there is a requirements of consulting the manual in order to decipher them. There are software in some ink toner cartridgethat will send a pop up notification while you need to change your ink cartridge.