The Casio PZ4000B personal CD player features a 40-second antishock memory, so you can enjoy your favorite  CDs during any activity. Bass boost cranks up the low end with just the push of a button, and the 20-track  programmable memory lets you customize CD playback to your liking. The player also features repeat play  functions (1/all) and a two-digit LCD screen. If you are on the move like me, you should invest the extra money, and buy a player with an anti skip feature, like this one.  As well, the Ultra slim feature of this product makes it handy to even carry in a large pocket, if you are walking down the street with a jacket or even pants with larger pockets.  It is a very attractive player, and the car kit is a definite bonus. The one downer about the product is the chinsy headphones that comes with it.  Casio always seems to have headphones that I could get for free on an airplane.  Koss has the upper hand in this department. But alas, I still give it 4 stars, because I have always had great success with Casio products, and this machine has so many excellent features.  I would DEFINATELY recommend this product, it has served me well!  Hope this review was helpful!  Like Neil Young says, keep on rockin' it the free world...peace.