... speaker 2.Support USB,SD card,MP3 player 3.FM radio 4.Aux in and Li-on battery FM/MP3/MP4 minisize portable stereo speaker ... stereo speaker *Plastic mini speaker *USB,SD,MMC card with MP3,MP4, ... impedance10Kohm 6.Loudspeaker Magnetically shield4ohm/5W 7.Speaker power3W+3W 8.Audio Input:standard ... charging interface. FM/MP3/MP4 minisize portable stereo speaker