Optimus CTR-107 - Manual (Page 13)

13
• Once you set the volume, do not increase it.
Over time, your ears adapt to the volume level,
so a volume level that does not cause discomfort
might still damage your hearing.
Traffic Safety
Do not wear the earphone while operating a motor
vehicle or riding a bicycle. This can create a traffic
hazard and is illegal in some areas.
Even though some earphones are designed to let you
hear some outside sounds when listening at normal
volume levels, they still present a traffic hazard.
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