iRulu 4 GB WMA MP3 USB Drive Music Player Built-in FM Radio Voice Recorder Powered by AAA Battery (Red)
I walk between 5-10 miles each day (am at the age I need that to keep from getting fat) and could not fine an MP3 player that would keep up a charge long enough for me (between 2-3 hours).  Finally, I invested in this and found it to be PERFECT.  Not only can I listen to the music I want, I can also listen to my preferred radio station.  Because this item is powered by battery, I needn't worry about it cutting off in the middle of my walk as long as I make sure the AAA Battery has not exceeded it's lifetime