Sony D-NE319 MP3/ATRAC CD Walkman (Blue) Feature-rich personal CD Walkman compatible with compressed MP3, ATRAC3, and ATRAC3plus formats Plays up to 490 songs on single CD-R/RW disc in ATRAC3plus format Skip-Free G-Protection technology guards against music interruption Bundled with SonicStage CD-burning software and compatible with Sony's Connect Music store Runs for 41 hours on 1 AA battery; includes clip remote control; 1-year parts warranty