LG MS659 Quick Reference Manual page 62

Safety
60
portable audio device varies depending
on the nature of the sound, the device,
the device settings and the headphones.
You should follow some commonsense
recommendations when using any
portable audio device:
Set the volume in a quiet environment
and select the lowest volume at which
you can hear adequately.
When using headphones, turn the
volume down if you cannot hear the
people speaking near you or if the
person sitting next to you can hear
what you are listening to.
Do not turn the volume up to block
out noisy surroundings. If you choose
to listen to your portable device in
a noisy environment, use noise-
cancelling headphones to block out
background environmental noise.
Limit the amount of time you listen.
As the volume increases, less time is
required before your hearing could be
affected.
Avoid using headphones after exposure
to extremely loud noises, such as rock
concerts, that might cause temporary
hearing loss. Temporary hearing loss