PLAY / PAUSE: Switch between PLAY and PAUSE mode.

OPEN / CLOSE: Open the CD door, press again to close it.

STOP:To stop the playback or pause mode.

SKIP /SEARCH BACKWARD:
Press one by one to skip backward track by track, 
Press continuously to search backward. 

SKIP /SEARCH FORWARD:
Press one by one to skip forward track by track, 
Press continuously to search forward.

MODE:
Press one by one to skip forward track by track. 
Press continuously to search forward.  
   
RANDOM:
Press this button under STOP mode, to get into PROGRAM mode,
pressing under PLAY mode to select REPEAT 1 or REPEAT ALL.

CD / USB selector: To selector the playback from CD disc or USB flash
 
EAR-PHONE JACK AND VOLUME CONTROL: Random playing between all tracks