1.portable and convenient 2.clear sound quality 3.Can link MP3, MP4, CD, DVD, computer, IPOD, ... advantages,High fidelity,Dual Channel Stereo Speakers,Support SD/MMC/MS card, USB device,Compatible with MP3/ MP4/ PC, and mobile, etc. Portable, it’s ... Total Harmony Distortion: <1% Driver Unit: 2 Inch*2 4Ω Frequency Response: 150Hz-20 KHz USB Voltage: 5V (500mA) USB Special Cable: 1000mm ...