Sony D-NE1 Ultra Slim ATRAC3/MP3/CD Walkman CD, ATRAC3plus, ATRAC3, MP3, CD-R, and CD-RW playback lets you enjoy a wide variety of music Included SonicStage software lets you create your own ATRAC3plus music file compilations to store up to 490 songs on one CD Exceptionally thin design with dimensions that virtually mirror the size of the CD itself Skip-Free G-Protection technology provides quick recovery from both horizontal and vertical shock Comes with 2 AA rechargeable batteries, battery charging stand, AC adapter, headphones, SonicStage software, and carrying pouch