HOTCOLOR 970XL 970 XL Black Ink Cartridge 2 Pack High Yield CN625AM for OfficeJet Pro X451DW X451DN X551DW X476DN 1. What's in the box: 2 Pack Black Remanufactured Ink Cartridge for HP 970XL HP 970 2. 970XL 971XL ink Cartridges work with: HP Officejet Pro X476dw X576dw X476dn X451dw X551dw X451dn Printer 3. Page Yield: 970XL Black CN625AM Up to 9200 pages; 971XL Cyan Magenta Yellow Up to 6600 pages Per Ink Cartridge.(at 5% coverage) 4. Type: Work as HP 970XL CN625AM#140 HP 971XL CN626AM#140 CN627AM#140 CN628AM#140 Original Ink Cartridge ; Remanufactured by HOTCOLOR (ISO 9001 certified facility);Not made by HP. 5. Guarantee: 120 days quality warranty.If there is any problem,DO NOT hesitate to contact us. 970XL Black ( CN625AM ) 971XL Cyan ( CN626AM ) 971XL Magenta ( CN627AM ) 971XL Yellow ( CN628AM ) 1.Take cartridge out of the printer and close the door/cover 2. Turn the printer off and un-plug it from the wall for 30 seconds 3. Gently wipe the gold connection points found on the side of the cartridge; you may use a soft, lint free cloth or cotton swab and alcohol 4. Power the printer back on and allow it to fully warm up 5. Re-install the cartridge and make sure it &#039;clicks&#039; or &#039;snaps&#039; into place 6.Then the ink level will still read and the cartridge will print as normal even though it read as expired. 7.If the troubleshooting does not help, via email we will assist you further.