Product Description 1-Support MP3/WMA formats Built-in USB plug Portable USB flash disk 1xAAA battery Long time playback Specification: Dimension Length :97mm Diameter: 15MM weight 25g(with battery) LCD display EL backlight PC connection USB2.0(FS) Flash memory 128M-1GB Battery Li-polymer battery Max Play time :6 hours Music format MP1 .MP2 .MP3 .WMA .WMV .ASF .WAV Working temperature -5 to 40 deg c Operating System Windows98/se/me/2k/xp. Mac OS10. Linux2.4.2 Multi-language Simplechinese,Tradchinese,Japanese,Korean,English,French,Italian,German, Spanish,Swedish,Portugal,Denmark,Dutch