All of the newer laser printers Brother and HP have chips to read in the OEM toner cartridges. When your printer is online WiFi it calls home and gets the firmware updated and then it checks your toner. If you have printed so many pages or for so long it decides you need a New one whether or not its still printing good. The Epson ink jet with the large tanks prints forever on the factory ink and its not outrageous in price. But I am I not sure about the print head clogging issues they Used to have??