Sony NW-S703F - Manual (Page 14)

NW-S603 / S605 / S703F / S705F / S706F GB.2-887-746-11(1) NW-S603 / S605 / S703F / S705F / S706F GB.2-887-746-11(1)
Do not use headphones while driving and cycling, etc.
As headphones reduce outside sounds, they may cause a traffic accident. Also, avoid
listening with your headphones in situations where hearing must not be impaired, for
example, a railroad crossing, a construction site, etc.