See it in action: example    

FM Transmitter for iPod mini

If you have an iPod mini you need an iTrip mini. The iTrip mini FM transmitter lets you play your iPod mini’s music wirelessly through any FM radio — in your car, on the road, even at home through your stereo.

The iTrip mini was designed exclusively for the iPod mini. Its form factor matches perfectly all the curves and lines of the iPod mini. It sounds even sweeter. iTrip mini gives you the best possible performance because you can choose any empty station from 87.7 to 107.9. Best of all you choose and change your iTrip mini stations directly from the iPod mini itself.

The iTrip mini does NOT need batteries. It receives a tiny amount of power directly from the iPod mini – saving you from wasting hundreds of batteries a year. That’s good news for the planet and even better news for your wallet.

The iTrip mini can even be used while charging your iPod mini in your car or while docked.

iTrip mini doesn’t have a power switch - it doesn't need one. Just plug it in and go. It shuts off automatically after 60 seconds of silence just like the iPod mini. You see, we designed the iTrip mini to be the ultimate iPod mini accessory because it lets you share the music and share the fun. Forget the headphones. Get an iTrip mini and go wireless!

Technical Specifications:

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      Built-in antenna
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      Power Requirement: None (it's powered by the iPod)
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      Modulation: FM Stereo
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      Frequencies: 87.7 - 107.9 MHz
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      High stability crystal oscillator, phase-lock loop control
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      Stereo separation: greater than 45 dB
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      Signal distortion: less than .5%
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      Frequency response: 50 Hz to 15 kHz
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      Operating range: 10-30 feet, depending on the quality of the FM radio receiver (limited by FCC regulations)
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      FCC compliant
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      International frequencies software selectable

Features:

    * Any station you choose - digitally--The iTrip allows you to select from over 100 stations, which means you can always find an open band no matter how many radio stations are in your area. You can choose any station, not just the '4 stations' typically found on other devices.

    * Just say 'NO' to drift--Digital tuning in iTrip also means the signal doesn’t "drift." Other products use analog circuitry, which allows the signal to drift over time. But not iTrip. Digital tuning means no drift.

    * Power to go--The iTrip is also more powerful than competing products, providing a significantly more powerful signal. Although the transmission range will vary depending on your area and receiving radio, iTrip has been used at some pretty amazing distances.

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