Quick overview from the supplier:
Laser Cartridge for HP CF540X Black Compatible SCC 002-01-SF540X
Printer Model
Canon i-SENSYS LBP621
Canon i-SENSYS LBP623
Canon i-SENSYS MF641
Canon i-SENSYS MF643
Canon i-SENSYS MF645
HP Color LaserJet Pro M254
HP Color LaserJet Pro MFP M280
HP Color LaserJet Pro MFP M281
