ipega elegant Multi-function Stand style Charging Dock with Speaker for iPhone /iPad /iPod /Samsung (Black) The Micro USB supports Galaxy S2, Galaxy S3, Galaxy Note2, but only for charging for other brand mobiles. The audio digital amplifier adopts 2.0-channel high-power output; With 3.5mm LINE IN port,support other external speaker device(Like MP3,MP4 and so on) Four functional electronic switch (audio switch, audio input selection, volume + and volume -), easy to use;