Remove your Plantronics C054 ear gel. Replacement ear hook pack
(3 ear hooks, 2 ear gels, 1 foam sleeve)
Rotate your ear hook 90 degrees and you'll feel the ear hook unlock and now can be removed.
Line up the headband with your CS540
earpiece and install the headband. Replacement CS540 (C054) headband
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