Function: (1)Recharge: USB charging, USB download charging, independent charging. (2)compatible with CD player,PC/MAC,MP3 player,MP4 player, DVD player (3)Mute function (4)suitable for: IPOD, Sonny Ericsson mobile phone, SAMSUNG mobile phone,MP3 player and so on. Technical information: output: 2*5w(stereo) respond frequency: 100HZ-20KHZ Input sensitivity: 500mv-1.5v voltage: Ac 220v/DC 12v (50HZ-60HZ)