... Function1).SPEAKER SYSTEM, mini portable loudspeaker, waterproof speaker bag2),Function:MP3 format3),Can play music by link to mobile phone ... more convenient to carry out. 3) portable: can connect to MP3, CD, walkman, notebook computer etc. Various audio equipment, can provide plenty ... , can cause ear pain and even damage eardrum, damage hearing. MP3 speakers can let you release the headset, in case of ...