... Lithium polymer (2,800mAh) Mode of operation: mechanical keypad E-book: ANSI, Unicode TXT, Doc, PDF, HTML, FB2, PDB,and EPUB ... 320kbps EQ: normal, Microsoft PlayFX, rock, pop, classic, bass,and jazz Microsoft PlayFX: 3D, bass and volume equilibrium Repeat mode: once ... USB port: USB 2.0 7 inch TFT digital electronic book