with USB,TF card ; FM PLL; Stereo headphone output. play the MP3 files in USB and SD card automotically;FM 87-108MHz stereo,PLL;3.5mm Aux in , can connect with PC ,Mobile Phone , MP3 player,and iPod ,iPhone etc;2Wx2 ch THD 10% ;horn radiator & 400mAh lithium cell; portable usb speaker