... Lithium polymer (2,800mAh) Mode of operation: mechanical keypad E-book: ANSI, Unicode TXT, Doc, PDF, HTML, FB2, PDB ... 3D, bass and volume equilibrium Repeat mode: once, repeat song, repeat folder once, and repeat all Play mode: shuffle ... and loop Information display: (ID 3tag) album, song title, and artist File browse: list Others: show photos ... USB 2.0 7 inch TFT digital electronic book