This iTrip FM transmitter fits flush to iPod without overlapping or anything, it actually looks like it is part of it.

FM transmitters are the most exciting things in the world, but this ones size means that there is a lot going for it, with easy set up and operation it makes the whole operation very easy and satisfying, although there are some limits to the distance between to the device and the FM radio.

Features:

* Sized and shaped to fit seamlessly with 2nd generation iPod nano
* Compatible with 1st generation iPod nano, and with 4th and 5th generation iPod
* Uses Griffin-exclusive Smart Display™ Technology to show frequency information directly on the screen of your iPod
* Dedicated preset buttons for quick frequency selection and recall
* Included cap protects Dock Connector when iTrip Pocket is not in use
* Stereo/mono modes and other innovations for clearest possible sound

Quick to Set Up, Easy to Use.

Getting started with iTrip Pocket is simple:

* Find an unused FM station on your car radio
* Tune iTrip to the same frequency
* Enjoy your music, free from the tyranny of headphones

The cost of this device will be around $50, which is good for this device.

Source [Chip Chick]

http://chipchick.com/2007/06/itrip_pocket_fm_transmitter_for_the_ipod_nano_review.html