Sony WALKMAN NW-E393 Help Manual page 251

Help Guide
Troubleshooting
Digital Music Player
NW-E393/E394/E395
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An alarm (beep) is heard and the message [Check the volume level] is displayed.
An alarm (beep) and a warning [Check the volume level] are meant to protect your ears
when you turn the volume up to a level that is harmful for your ears for the first time.
You can cancel the alarm and warning by pressing any button.
You can turn up the volume after canceling the alarm and warning.
After the initial warning, the alarm and warning repeat every 20 cumulative hours that
the volume is set to a level that is harmful for your ears. When this happens, the volume
is turned down automatically.
Related Topic
Volume operation (Only for countries/areas complying with European Directives)
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