Sony D-SJ303 S2 Sports CD Walkman Durable, water-resistant personal CD player designed for active use Skip-Free G-Protection technology guards against music interruption 3-way control key on grip allows easy operation while jogging Compatible with CD, CD-R, and CD-RW formats; 64-track programming Runs for roughly 50 hours on 2 AA batteries (not included); 1-year parts warranty