... ,etcB,mobile device,such as PC,mp3/mp4 player,Mobile phone,etc2,it has the function ... product feature Part number:SG-339 mini portable multimedia speakerinterface:USB,SD card,3.5mm stereo jacksupport ... MP3/MP4Power supply:DC 5v/Li batteryfunction:music player/loudspeaker/FM radio technical parameter: Output power: ... .and our digital products covers from Mp3 player/Mp4 players,to mini speakers,etc.We are ...