Nextar Digital MP3 Player - Manual (Page 19)

.... 2. Or press the V+ or V- button to select the song which you want to
listen. Press the M button to confirm playing the selected song firstly
b. Select to play the music in the folder and sub-folder:
1. You can press the V+ or V- button to find the relative folder and press
M to confirm ... playing all songs in this folder.