System navigation
Gesture, 2-button and 3-button navigation are available.
Tape mode theme
Select the theme after entering Tape mode.
Nultifunction button
1.In Player mode: Add to Favorites (default option), Play next song randomly
(randomly play the next song according to random play rules), Play/Pause,
Delete currently playing song, Switch filter (cyclically), Switch equalizer
(cyclically), Enter USB DAC Mode, Enter Bluetooth Receiving Mode, Lock
screen/Wake up, No function
2.In Bluetooth Receiving mode/USB DAC mode, the multifunction button is
forcibly set to: No Function.
Note: This button only responds in Android mode/Pure Music mode, and some
functions only apply to FIIO Music.
Power-off timers
Sleep: when the set time is up, the M21 will turn off automatically. The sleep time
can be set as any integer values between 0 and 120.
Idle poweroff: the M21 will automatically turn off when the timer reaches the set
time for idle poweroff when there is no operation or playback. During this
process, the timer will restart if there is any operation or playback. The idle