1,USB interface,connect U-disk and SD card to play Mp3 format music 2,kinds of sound mode 3,FM radio 4,rechargeable battery Name:USB/SD SpeakerSpecification:20*4.1*7.8cm Model:AS-01Material:ABS PlasticSingle Weight:400gDetailed description of product functions:1,Standard USB2.0 plot,could read SD/ SDHC / MS/ MMC card and USB Flash and play MP3 format music automatically and intelligently .2,FM ...