... /SD card slot Digital portable Mini speaker for Iphone, computer,CD, MP3 & Mp4 mini speaker, computer speaker, speaker,mini computer ... concept integral stereo portable mobile music, connecting your MP3, MP4, CD, DVD, iPod, iPhone, GPS, PSP, mobile phone, notebook computer, Micro ... may stop when voltage is above 6V and turn into over voltage protection condition, this time you should change to adapter ...