1)Music Format: MP1/MP2/MP3/WMA/WAV/ASF/WMV 2)Capacity: 128MB/256MB/512MB/1G 3)Playing time: Can continuously play music for about 350~400 minutes after full charge 4)Electronic disk: Mobile storage support 5)Equalizer Mode: 7 different EQ modes (POP/Classic/Soft/Jazz/Dbb/Rock/Normal) 6)Volume: 32-step volume adjustment 7)PC port: USB 2.0 high-speed transit 8)Battery: Li-ion battery 9)Operating System: Windows 98/Me/2000/XP