1.alto-falante 2. with USB charge 3. with mp3 player Main function and features for alto-falante 1, Support SD ... you insert2, With AUX IN, it can compatible with MP3, MP4, CD player and PC, etc.3, With FM radio function, frequency ... you insert2, With AUX IN, it can compatible with MP3, MP4, CD player and PC, etc.3, With FM radio function, frequency ...