Sony D-NE500 ATRAC Walkman Portable CD Player (Black) Portable CD player compatible with MP3 files and Sony's ATRAC3plus compression technology; 4-line display with advanced text navigation Includes SonicStage CD Simple Burner software to facilitate ATRAC3plus CD burning from MP3 files and from other CDs Skip-free G-Protection technology eliminates or reduces skipping during many active uses; includes clip-on remote control Bookmark playback function for easy programming, auto-ranking playback programs your favorites based on listening frequency Up to 70 hours extended playback with just 1 AA battery (not included)