The Everprint CHIP-CAN-T15 is a laser cartridge chip intended for use with Canon i-SENSYS X1871 and Canon i-SENSYS X1861P. It is a replacement component for a cartridge, rather than a complete toner cartridge.
The chip communicates cartridge resource information to the printer. The listed 42,000-page yield and black colour identify the rated variant. Replacing the chip during cartridge refilling or restoration helps the printer read its cartridge status and page count.