Sony PRS-900, PRS-900BC On heat build-up, On the headphones

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Other Information
On heat build-up
Heat may build up in the Reader while charging, or if it
is used for an extended period of time.
On the headphones
Road safety
Do not use headphones while driving, cycling, or
operating any motorized vehicle. It may create a traffic
hazard and is illegal in many areas. It can also be
potentially dangerous to play at a high volume while
walking, especially at pedestrian crossings. You should
exercise extreme caution or discontinue use in
potentially hazardous situations.
Preventing hearing damage
Avoid using the headphones at a high volume. Hearing
experts advise against continuous, loud and extended
play. If you experience a ringing in your ears, reduce
the volume or discontinue use.
Caring for others
Keep the volume at a moderate level. This will allow
you to hear outside sounds and to be considerate to
the people around you.
Warning
If lightning occurs while you are using the Reader, take
off the headphones immediately.