MP3 player different available ) supports MP3, MP3 VBR, AAC,M4A, M4B, M4P and WAV2) Up ... to 3 hours of continuous playback with rechargeable lithium-ion battery . 3) USB ... and 2.0 compatibility through integrated USB connector This device has no such restrictions in fact you can hook it ... 1GB~4GB Colors Available: Blue, Green, Sliver, Black, Rosy MP3 player