I use this to play music through my iPhone. They sell these in Wal Mart and I bought one a while back. It's nice and convenient...when it works. It seems like every other month or so it will start to malfunction (it seems as though a connection becomes loose so you start hearing a bunch of wierd high frequency noises and it will allow sound only on one side of the car. I've exchanged between 4-6 of these. I haven't bought a better one yet because I'm quite frugal.I guarantee most, if not all, of the positive reviews on here have only used this thing for a week or so.