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The Griffin RocketFM is a USB FM transmitter that can use any available frequency to broadcast your music from your PC to any nearby FM tuner in stereo or mono. It's easy to set up, and sound quality is fairly good, though you'll need to adjust your PC and stereo volume to find a good low-distortion balance. On the downside, you can't use the Rocket-FM with portable players, and you have to use the software to change the frequency.
Mike Kobrin is PC Magazine’s lead analyst for audio products, including headphones, MP3 players, and speakers. He is also a working trumpet player in and around New York City.