1.usb altavoz support usb/mp3 player 2.with USB charge Main function and features for usb altavoz1, Support SD card and USB disk, automatically read ... It is convenient for your travel ,portable, super slim and mini size, easy to carry7, Material: Pure ABS+ metal loudspeaker ... It is convenient for your travel ,portable, super slim and mini size, easy to carry7, Material: Pure ABS+ metal loudspeaker ...