... radio MP3 player *mp3 player with built in speaker Mp3 player with built in speakerspeaker mp3,fm radio mp3 player, ... true digital repeat function to support the text in multiple languages; 5,AB repeat function, 7 ... hours.Otherwise it will extremely easily caused the built-in lithium battery failure and damage. 3.Pls ... more than 2 hours.Pls remove hardware in computer first,then Pull out the mp3 player ...