... /SD card slot Digital portable Mini speaker for Iphone, computer,CD, MP3 & Mp4 mini speaker, computer speaker, speaker,mini ... concept integral stereo portable mobile music, connecting your MP3, MP4, CD, DVD, iPod, iPhone, GPS, PSP, mobile phone, notebook computer, Micro ... ratio of power amplifier:?80Db*Loud Speaker: 1.77 inch (external diameter 45mm), Magnetic resistant 4 Ohms*Power supply: 5V/ ...