You can use this for MP3/SD/USB it has 205 FM channels you can tune into. I use it in my 99 Intrepid ES 3.2L (autostick) with 240watt Infinity System with Power Sub and 9 speakers in 11 locations.
Here's a youtube video I made with how it sounds in my car on 87.9 FM/ST note this was recorded with 3200Hz with the engine on
http://www.youtube.com/watch?v=AMAEMaUYKvE
I've tested 1GB and 2GB SD plus 2GB USB Jump drive.. So far so good.. Cost of this is only $11 on Amazon or $19 on Geeks (but they keep on changing the prices on it)