Sony NWZ-E475BLK - Manual (Page 194)

Make sure the photo is not a damaged file, or the size is not too large.
[Noise Canceling unavailable. Unable to execute.] (NWZ-E573/E574/E575
only)
[Quiet Mode] is unavailable because the usage environment does not meet the requirement
for this function.
Make sure that [Noise Canceling: On/Off] is set to [On] [Details] and the supplied
headphones are used.
When using third party Noise Canceling headphones, you can disregard this message and
activate the Noise Canceling function of those headphones.
[Check the volume level]
An alarm (beep) and warning [Check the volume level] are meant to protect your ears when
you raise the volume setting beyond a specific level (*1) for the first time. You can cancel the
alarm and warning by pressing any button.
You can turn up the volume beyond the specific level (*1) after canceling the alarm and
warning.
After the initial warning, the alarm and warning repeat for every 20 cumulative hours that the
volume is set beyond the specific level (*1); when this happens, the volume is changed to the
initial setting automatically.
(*1) Specific level = [16]
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