Step 1
Remove your Plantronics C054 ear gel. Replacement ear hook pack (3 ear hooks, 2 ear gels, 1 foam sleeve)
Step 2
Rotate your ear hook 90 degrees and you'll feel the ear hook unlock and now can be removed.
Step 3
Line up the headband with your CS540 earpiece and install the headband. Replacement CS540 (C054) headband
Step 4
Rotate your CS540 earpiece microphone 90 degrees to be used on your left or right ear, whichever you prefer. *2 step Plantronics C054 battery replacement guide