You can either use an external 1/8 Audio out cable to the audio in / AUX jack on you car stereo (if you have one) or you can use the 720s built in FM transmitter to transmit it to a dead FM station and play it in your car.
If you go into the TT settings (I don't recall the menu location), and try using the FM transmitter, you will get a screen that allows you to type in an fm station's numbers. So you kind of search your fm dial for empty, less staticky stations and hope it works. I find that I cannot find a good reliable quiet station.
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