HJC Smart 20B User Manual page 12

SMART HJC 20B
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.
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9. Reattach the cheek pad beginning with the rear and click the
snap fasteners.
Note:
Please refer to the video on the HJC homepage (www.hjchelmets.com) for
detailed information.