Sony D-CS901 Operating Instructions Manual page 36

Traffic Safety Tips
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Do not use your unit while operating a motorized
vehicle or bicycle. It may create a traffic hazard and
is illegal in many areas.
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You should use extreme caution or temporarily
discontinue use in potentially hazardous situations.
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Even if your headset is an open-air type design to let
you hear outside sounds, don't turn up the volume
so high that you can't hear what's around you
REMEMBER mmmm
USE YOUR HEAD
WHEN YOU USE
YOUR HEADSET.