LG H635C Guía De Usuario página 11

Avoid damage to your ear
Damage to your hear can occur due to constant exposure to excessive high sound.
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We, therefore, recommend that you do not turn on or off the phone near your ear.
We also recommend you be reasonable with the music and volume level.
If you listen to music, please ensure that the volume level is adequate, so that you
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are aware of your surroundings. This is particularly important when attempting to
cross a street.
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Guidelines for safe and efficient use