The title pretty much sums up the idea. I love my dvr for my television at home and rarely watch live tv anymore. I have a 45 minute commute to work and like to listen to comedy and/or talk shows on the radio. Sometimes I miss a comment and want to hit the "rewind" button on my radio. This feature would also be helpful if you were to miss a weather or traffic announcement because the kids were screaming in the backseat!