Item Name: 4-Pack Compatible Toner Cartridge Replacement for HP W1340X 134X Black Toner Cartridge WITH CHIP. In order to use non-OEM toner cartridges properly,please turn off the printer "Automatic Update" function,which will not affect daily printing and quality printout.Upgrading the printer system to the latest version will result in the chip in the toner cartridge not being recognized by the printer, making it unusable.Activated HP+ service printers should use genuine toner cartridge????????????: The chip is not displaying the amount of toner remaining, which may affect the amount of prints and the number of pages, when installing the cartridge, see the computer “????????????” message, please skip to continue printing. Compatible for HP Printer: M209dw MFP M234dw M234sdn M234dw.Not Compatible with Laser jet 209dwe M234dwe M234sdne M234sdwe Page Yield: Up to 2,400 pages per W1340A toner cartridge (based on 5% coverage of Letter size Paper).