Schubert SR1 Manual De Instrucciones página 16

D. the helmet
SOUND-REDUCTION SYSTEM
The innovative sound-reduction system allows the sound level in
the helmet to be varied, thus enabling sounds to be experienced
at different volumes. Two settings are available.
Open:
In this setting sound levels are higher.
Closed:
In this setting, sound levels are lower.
Warning:
Riding with the sound-reduction system in the closed
position can prevent the rider from hearing important traffic
and warning sound (e.g., horns, bells, approaching vehicles),
and is recommended only for open road, rather than traffic
conditions.
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