FiiO M11 Plus Portable High-Resolution Lossless Wireless Music Player - Manual (Page 50)

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The volume of the system, touch panel, and power-up can be set to a fixed value
to avoid over-high volume due to misoperation and so to protect your hearing.
a. Max system volume- limit the adjustable volume of the volume button to a
fixed value
b. Max touch panel volume- limit the adjustable volume of the touch panel to a
fixed value
If the max adjustable volume is set to 60, it means the volume can be set to 60 at
most and its sensitivity will be limited within 60.
c. The power-up volume defaults to be 60, which can be set to other integer
value based on your own habits.