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Belkin TuneCast Auto Live
If you're going to carry around your entire music collection with you wherever you go, it makes sense to be able to access that resource when you're on the move. One place where it's great to have access to your tunes is when you're in the car. If your car stereo isn't equipped with Bluetooth, then the easiest way to pipe your tunes from your iPhone to your car stereo is by using an FM transmitter.
By far the best FM transmitter for the iPhone that I've used is the Belkin TuneCast Auto Live. Featuring ClearScan technology, it can scan for the clearest FM frequency for you to use. The optional iPhone app can be used to recommend the best frequencies for you to use as you travel. TuneCast Auto Live is also the only FM transmitter with GPS-assisted frequency scanning, allowing for the best audio quality when you drive.
As an added bonus, this device will keep your iPhone's battery charged up while you use it, so there's no need for a separate car cord.
Image credit: Belkin