AT&T TL8900 User Manual page 25

Getting started
Headset attachments
To remove the earbud and ear hook from the headset:
Remove the earbud and ear hook when you need to change to
the over the head or behind the neck style.
1. Hold both sides of the earbud. Twist and pull the earbud until it
separates from the earpiece.
2. Rotate the ear hook to vertical direction.
3. Pull the ear hook until it separates from the headset.
To re-insert another set of earbud and ear hook, refer to the
previous section.
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