Remo te Control Fu nction Press t hese but tons t o access t he previou s(-) or n ext(+ ) fold er when using USB/ SD mode . Press t his b utt on to switch be twe en USB/SD , FM , BLUET OOT H and modes. Pre ss th is but ton t o go to the previou s or n ext song or ch anne l whe n using USB/SD o r F M mode. Press t his b utt on to play o r p ause the MP3 son g when u sin g USB/SD m ode or se lect F M ch anne l autom atically. Press t his b utt on to decrease (-) o r increase(+ ) the volu me.