Sony D-NS505 S2 Sports ATRAC Walkman Portable CD Player Portable S2 Sports CD player compatible with MP3 files and Sony's ATRAC3plus compression technology; 2-line display with ID3 tag recognition 2-line dot-matrix display built into the handstrap offers full ID3 tag recognition, and bookmark playback Includes SonicStage CD Simple Burner software to facilitate ATRAC3plus CD burning from MP3 files and from other CDs. Software is not Macintosh compatible. Skip-free G-Protection technology eliminates or reduces skipping; active control playback operation simplifies active use More than 75 hours extended playback with 2 AA batteries (not included) for ATRAC recordings and over 50 hours continuous audio CD playback