Control DIY MP3 player with just 2 buttons. One button function shouls Play and Pause. Another button is Next /Previous track. Short/long press could be used for one button. Or one quick press or 2 quick presses
Here is name of the Module from Aliexpress: Voice playback module MP3 player IO trigger playback Serial port control playback DY-SV5W
Could be different but similar MP3 Player Module with TF Card and USB Power supply.