For outdoor entertainment enjoy this TrailAudio 512 digital audio MP3 player. Features: 512mb Skip-free flash memory, MP3 / WMA / ADPCM Playback, Built-in Full-Speed USB 2.0, Splash proof construction, Detachable Carabiner, up to 15 hours of continuous play, customizable equalizer, FM radio [with 12 station presets], FM recording [in MP3 quality], Line-in recording, bright backlit LCD, Simple drag + Drop for music + Data files. Requirements: Windows 98SE or higher, MAC OS X [10.1 or higher] or USB port. High performance sport headphones included.