1.mp3 music player,mini mp3 player 2. compatible with all notebook,laptop,computer 3.USB speaker... 4.Use:Portable Audio mp3 music player,mini mp3 playerModel ... the computer,PDA, the handset,MP4,the U plate,the SD card and soon… 2.Small size,travel,sports,recreation. ... acoustics structural design.5.Porwer supply way:the built-in lithium ion battery+outside sets at the power source adapter. ...