HJC Smart 20B User Manual page 7

Note:
Removing the Speaker
To remove the speaker, insert the Allen Wrench to the upper shorter hook
area then gently pull out the speaker unit.
7. Insert the back plate of the button module between the shell and
the EPS on the left side of the helmet.
8. Slide the left clip into the corresponding side between the shell
and the EPS.
SMART HJC 20B
7