It makes sense to me with Bluetooth because the sound system and device are connected. But when it’s regular radio, how is it receiving and displaying this information?
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Most modern radio stations on FM now also send a digital signal with the radio signal that allows them to do a few things, one of them is display that info. If your radio supports it. Another thing is HD Audio, if your radio supports it.
So if you are tuned into a modern station, you can get that info.
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