Goodmans 359780 - Your High Power Bass Bluetooth Blaster Overview; In The Box Contents

2.2 Top View
Power ON / OFF Button
Play / Pause
Press the button once to play or pause the music.
Hold the button to turn ON / OFF.
Mode
Press the button to select Bluetooth, USB, TF card, AUX mode.
Previous Track / Decrease Volume
Press the button once to go back to the previous track.
Hold the button to decrease the volume.
Next Track / Increase Volume
Press the button once to the next track.
Hold the button to increase the volume.
USB Port
TF card slot