I love my iPhone, but I can’t hook it into my car’s ancient audio system and listen to my own music as I drive. The Jupiter Jack is intended to be a speakerphone, but it works equally well to transmit tunes from your iPod via your car’s stereo system. Plug it into the headphone jack on your phone or MP3 player (it comes with six adapters that work with most gadgets), turn it on, and tune your radio to the frequency specified on the jack. It comes through loud and clear, for the most part (honestly, it does pick up a little interference from time to time), and a little fuzziness is a small price to play in order to hear what you want, when you want, on the road.

$9.99 at Best Buy.

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