If you're an avid jogger, this is the Portable CD Player for you! The Jogproof MPC500 features a 45-Second Electronic Skip Protection for continuous music play and up to five times faster shock recovery than conventional systems. What this means in layman terms is that you can feel free bounce around the room, if you choose, and you won't risk interrupting your music! This model also features 22-Hours Playback, Digital Dynamic Bass Boost and is MP3 & CD-R/RW Compatible!