HP
7121-8541
is compatible in the following HP Models:
HP LaserJet M700 Printer series
HP LASERJET PRO M701A - B6S00A
HP LASERJET PRO M701N - B6S01A
HP LASERJET PRO M706N - B6S02A
HP Color LaserJet Multifunction M680 Printer series
HP COLOR LASERJET MANAGED FLOW MFP M680ZM - L3U48A
HP COLOR LASERJET MANAGED MFP M680DNM - L3U47A