I found this extremely useful because before, when I went on vacation my ipod would run out of batteries and I wouldn't have any music for a few days because I couldn't get to a computer. You just have to plug it into the wall and put in it the cord that you put into your computer to charge it. You can use it while using the itrip or any other accesories. I would recomend this to all people expecially if you travel or are away from a computer for awhile. It is well worth the money.