... box for psp2000, for psp3000, pc, mp3, mp4,s DVD, TV Voltage:DC12-15V 2A Subwoffer: 15W(RMS) Speaker for PSP1 ... ", "play/pause"...etc function through the host stereo or the remote control.3).Control bass volume, mute, turn on/off... etc ... music. Speaker for psp 2000, psp3000, pc, mp3, mp4, DVD, TV