Installation instructions 1. Remove the Orange nozzle cap gently. 2. Insert it into the corresponding slot and push it down firmly until it snaps into place. Compatible printers: PIXMA iP3600 PIXMA iP4600 PIXMA iP4700 PIXMA MP560 PIXMA MP620 PIXMA MP620B PIXMA MP640 PIXMA MP640R PIXMA MP980 PIXMA MP990 PIXMA MX860 PIXMA MX870 Note: The printer possibly prompts you're not using genuine ink cartridge. Please just ignore that message and press 'OK' or 'Continue'. The ink level may not read correctly since these are compatible ink cartridges. Once you can print with these cartridges, please don't try to upgrade your printer firmware. The manufacturer may block them with a new version firmware.