Using a iPhone FM Transmitter is a great way to play your favourite tunes through your car's stereo system without the need for a wired modification.
They plug into the bottom of your iPhone, and usually feature digital display where you can select the frequency you wish to broadcast on. They draw power from the iPhone dock connector, so there's no need for extra batteries.
Most have multi-channel selections so you can tune in to a un-occupied channel. The best bet in using a iPhone FM Transmitter is to find a frequency on your radio that is quiet, and has no nearby stations. Then, punch that frequency into the transmitter and this will ensure you have a static and interference free reception.
There's a range of transmitters available online, and some are cheaper then others. We recommend you steer away from anything below $15 as these can be cheaply made, break easily and give poor sound quality and signal strength. We recommend you aim for reputable brands such as Belkin. This will ensure you a long life, and quality sound.
You'll find iPhone FM Transmitter prices listed on eBay below. Click on any FM Transmitter and you'll be taken to the eBay page where you can bid or buy it now.