Package includes:1 CF540A Black, 1 CF541A Cyan, 1 CF542A Yellow, 1 CF543 Magenta.Page yield:Up to 1,400 pages per black toner cartridge and 1,300 pages per color toner cartridge at 5% coverage.*Tips: Please confirm your printer model#.100% Compatible with following printers:▶HP Color Laserjet Pro M254nw MFP M254dw.▶HP Color LaserJet Pro MFP M280 M280nw M281cdw M281fdn M281fdw.▶The CF540 toner cartridge needs attention, because the original chip is being upgraded. If the printer is connected to the Internet, a dialog box will pop up, prompting the user whether to upgrade, please click "Cancel Upgrade", otherwise the compatible toner cartridge cannot be used normally and the original one must be used The toner cartridge can be used normally.▶How to operate:▶When the "Automatically install printer updates" dialog box pops up, please click the "X" in the upper right corner to close it, and do not click the "Install" button.▶While you are using the toner cartridge，the printer prompt for the option of "upgrade"。If you upgrade the printer , You can do the following steps :1.First, click “Setup” to enter “Setup Menu”, Slide down to find “Service”and click “Laser Jet Update”。2.Click“Manage Updates”, then choose OFF for “Check Automatically”。3.NO for “Allow Updates” to disable them , Finally selcet “Yes”for “Allow Downgrade”。How to contact us: Log in your amazon buyer account > Click Your Account > Your Orders > Find your order and click CONTACT SELLER, then we will give you a response as soon as possible.