... DVD player,support DVD,VCD,CD,MP3,MP4 formate 5. with USB Jack, can read and play song ... .6.With dvd display screen,can display time and music work situation7. with CD ... more loud and clear.15.with external battery jack,can connect with outer DC12V battery16.Built-in ... /metalConnectorbuilt-in 12V 17Ah battery , with USB / SD jack , as weill as CD , VCD , DVD , MP4 , WMA , WMV ...