MSA F1 XF Manual Del Usuario página 6

Installation
(6) Before the second earphone can be installed,
pass the second earphone behind the lateral
strap.
(8) Pass the earphone behind the second lateral
strap.
(9) Install the second earphone in the same way as the first.
GB
Ensure that the front retention strap does not obscure field of vision
6
Communication Accessories and Hearing Protection F1 XF
(5) Position the strap behind the earphone as indi-
cated on the second picture.
(7) Pass the earphone in the gap between the
suspension straps and the inner cap.
WARNING