high quality competitive price fine appearance best service small size Our speaker fits multi-area, supply 3.5mm audio line and USB power line(or supply power through battery),it is suitable for many electronically devices(iPod, cell phone,mp3,mp4 and so on) and laptop ,pc and so on.Tech parameter:Export power of power amplifier:2W*2(THD=10%) RMSPower amplifier SNR: more than 85dBInput resistance ...