If there's no aux input, then the radio transmitter type devices are the best bet for a "no screwdriver" type install. I thought the monster one worked well when I had it (but the model I used was many years ago before iPhone). As a previous post stated, as you travel across areas, you'll find areas of interference. I'm not saying it's the cleanest and clearest solution, but it involves no real installation process. If your stereo deck has an aux input, then obviously go that route. I assumed that since you were asking, it didn't have one. I don't have a "best" one to recommend. Maybe check out amazon and google ratings before deciding on one.