Support multi-audio format such as: MP1, MP2, MP3, WMA etc USB 2.0, support 128MB-1GB flash Double track stereo playing The playing current is lower than 50 MA One AAA alkali battery can play about 10 hours Drive free U-disk function .Need no managing process, can operate the file directly by the “moving disc” via “my computer”. Support Windows 2000 above no drive needed.