Digital speaker for ipod/ mp3/mp4/mobile phone compatible with CD player,PC/MAC,MP3 player, ... function4.suitable for: Ipod, Sony Ericsson, NOKIA, SAMSUNG mobile phone,MP3 player and so on.Output: 2x5w (stereo)respond ... four pieces I-pod backrest, Extra for four kinds of mobile phone docking , add USD3.00Box size:300*290*245mmCarton size ... for cooperation Digital speaker for ipod/ mp3/mp4/mobile phone