Canon EP-22 toner cartridge (1550A003) supplies black toner for supported Canon laser printers. Canon lists it for the LBP810, LBP800 and Laser Shot LBP1120, making it a replacement consumable for printing with those models.
The stated yield is approximately 2,500 A4 pages at 5% coverage. Actual page use varies with the amount of text and graphics printed, so the figure is a guide to expected cartridge capacity rather than a fixed page count.
Canon also provides a return route for used toner cartridges for reuse or recycling.