Sangean WR-22 (V1) - Manual (Page 29)

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Search function
While the USB memory device is playing, press and hold the Fast-
forward or Rewind button. Release the button when the desired
part of the current file is reached.
To skip to another folder
With the USB memory is in stop or play mode, press and release
either the Folder Up / Down button. The first file of the next or
previous folder will be played.
Note:
If your USB contains a folder without files, the device will skip the
folder and play the files in the next folder.
Play mode
When playing the files in USB, press and release Play mode button
to select.
Repeat 1: repeatedly play the file you are listening to.
Repeat Folder: repeatedly play the files within the folder you are
listening to.
Repeat All: repeatedly play the folders in the USB.
Random: it will play files in the USB by in random.