Sony WALKMAN NW-MS11 Operating Instructions Manual page 86

Traffic Safety Tips
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Do not use your unit while operating a motorized
vehicle or bicycle. 11 may create a trafiic 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 il 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 . ..I
USE YOUR HEAD
WHEN YOU USE
YOUR HEADSET.