... J4750 )Power (battery type): built-in lithium polymer (2,000mAh)Mode of operation: mechanical keypadE-book:ANSI, Unicode TXT, Doc, PDF, ... rock, pop, classic, bass, jazzMicrosoft PlayFX: 3D, bass, volume equilibriumRepeat mode: once, repeat song, repeat folder once, and repeat allPlay ... mode: shuffle and loopInfo display: (ID 3tag) album, song title, ...