Daping DP18-Pro User Manual page 6

(Note: If you pull out the earphone together with the USB conversion
adapter/remote control during playback, the playback will also be
stopped. However, if you do not pull out the USB conversion adapter
and remote control but only the earphones, the playback will not be
stopped.
Directly play music on the voice recorder
If you press and hold the "Play" button on the USB conversion
adapter/remote control during stopped playback or during playback,
you can switch to music mode. Press the "Play" button to stop
playing the music. (Hold down the "Play" button also when switching
from music mode to playback mode.)
(When switching modes, the power light will flash red once to
indicate that the mode has been successfully switched.)
Note: Do not put the music files in the folder, put them directly
into the product drive. If you put a music file in the "RECORD" folder,
it will be played as a recording file. Even if you press and hold the
mode/playback button for a long time, the file cannot be recognized
as a music file and will not be played. (As shown below)
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