... ,mp3,mp4,PC,IPOD and other audio speaker 2.one year warranty 3.fashionable design ... the DC5V power input socket of speaker, and to charge or recharge this speaker system. 2. With SD/MMC ... No need to shift among U disc/SD/MCC, speaker automatically read the first input media device, If ... , then speaker can read MP3 music file from U Disc. 4."Volume-/ Backward, long press this button, Volume decreased, ...