The D-NS505 S2 Sports Walkman& is ready for your toughest workout. Its water-resistant design includes rubber gaskets, bushings, and seals that help keep out water, moisture and dirt. Its heat-resistant lid protects against high temperature build-up, and the Skip-Free G-Protection™ Technology provides quick recovery from bumps and shocks.The D-NS505 has some great features too. It includes 18 playback modes, providing tons of options on how you want to listen to your music. It also supports CD Text and ID3 Tagging, so you can easily view song, album and artist information. Plus, it delivers over 50 hours of continuous playback with just 2 "AA" batteries, and the D-NS505 supports ATRAC3plus™, ATRAC3, MP3 and CD-R/RW playback formats. Atrac3plus lets you put up to 490 songs on on 1 CD-R/RW disc, and the SonicStage& Software makes it easy to transfer music from your PC.