How to Use: 1. The nozzle protection clip should be removed before the ink cartridge is installed on the machine, (some do not have), and the tail marks (air guide hole seals) on the ink cartridge nozzle must be torn off. 2. When replacing a new ink cartridge, clean the print head before the original ink cartridge runs out of ink. 3. After installing the ink cartridge, let the ink cartridge stay in the ink cartridge holder for 5 minutes. Clean the print head until the nozzle check is normal. 4. If there is a disconnection or lack of color, let the ink cartridge stay in the cartridge holder for 10?15 minutes. 5. If the printing problem still exists, check the print head 1?3 times according to the printer manual until the printing is unhindered. 6. If the printer does not recognize the ink cartridge, please remove the ink cartridge and reinstall. If the printer still does not work, try restarting printer. 7. After the ink cartridge is opened, use up within 6 months to ensure good printing effect. 8. Please do not remove the ink cartridge from the printer until the ink is used up. 9. The printer is turned on at least once a week to prevent clogging of the print head Specification: Item Type: Refillable Ink Cartridge Material: PP Color: Black, Cyan, Magenta, Yellow Applicable Scenarios: Used for printing test papers, printing photos, printing documents Applicable Model: For 932 933 Applicable Area: Europe Applicable Models: Used for HP Officejet 6600 6700 7110 7510 7610 7612 Chip Type: Recyclable Ink Display, Resettable Package List: 4 x Ink Cartridges