1,Support USB,SD,MMC card to play mp3 music 2,Built-in rechargeable lithium battery 3,Support USB/SD switch automatically Name:Outdoor SpeakerSpecification:16.2*6.3*6.3cm Model:ASYX-04Material:ABS Plastic Singlet:390g Detailed description of product functions:1,Standard USB2.0 plot,connected with U Disk,play MP3 format music.2,For SD/SDHC / MS / MMC Card,plug-and-play,Play MP3 format music.3, ...