FiiO M11 Plus Portable High-Resolution Lossless Wireless Music Player - Manual (Page 80)

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Notes: if the system is reset to factory mode, all EQ settings will be reset to
default.
6. UV meter
There is a newly added UV meter (audio meter) with a dB threshold and dynamic
pointer displayed. Closing to the red threshold of 0dB means audio distortion.
How to enable it: tap the song cover on the now playing page to enter the UV
meter displaying page.