Highlights:<br><br />  BOX PACKAGE guarantees you receive properly handled and pristine cartridges. <br><br />  SAMPLING INSPECTION prior to shipment delivers you reliable high quality ink replacement. <br><br />  AFFORDABLE PRICE for HIGH YIELD ink is the smart choice for printing needs. <br><br />  EASY TO INSTALL saves your time and energy.<br><br /><br />Package Includes: <br><br />4 Pack Compatible HP 934XL 935XL (high yield) Ink Cartridge with updated chip <br><br /><br />Can be used in all printer models listed below: <br><br />HP Officejet Pro 6820 printer <br><br />HP OfficeJet Pro 6830 printer <br><br />HP Officejet 6220 printer <br><br />HP Officejet 6230 printer <br><br />HP Officejet 6812 printer <br><br />HP Officejet 6815 printer <br><br />HP Officejet 6835 Printer<br><br /><br />Warm Tips: <br><br />1. Please make sure that you inserted the correct cartridge into the corresponding cartridge slot. <br><br />2. If the new cartridge cannot be recognized at the first time・ please take it off and install again.<br><br />3. If the printer displays messages as:"Non-HP Ink"or"Not Genuine"after installation・ please click "OK"or"YES"to continue. <br><br />4. If it appears print issue like streak or broken lines after the new cartridges are replaced・ please try to perform a print head cleaning cycle 2 times.<br><br /><br />Installation Guide : <br><br />1. Please remove the orange protective cap carefully before using.<br><br />2. Then please insert the ink cartridge into your printer until the cartridge locks into the slot. <br><br />3. Finally print!<br>