Plantronics M155 - Manual (Page 5)

FIND YOUR FIT
The loop of the gel eartip tucks into the back
curve of your ear for a stable fit.
Try on the headset. The eartip is positioned to
suit most people, but you may want to rotate it
to best fit your left or right ear.
To remove the eartip, pull the loop of the eartip
away from the speaker stem. (Don’t pull on the
speaker base and stem.)
If the gel eartip feels loose or tight in your ear,
then replace it with one of the two alternate
size eartips.
Tuck the bottom of the new eartip over the
speaker and pull the eartip over the speaker.
(Don’t push the speaker through the gel eartip.)