Blue tooth audio
The main thing bluetooth is used for on the radio is to talk on the phone and the phone operates through your audio system. When someone calls the phone will ring through the audio system and mute the music so you can talk. You can also transfer music, and info like that as well. To me it's a feature that is pointless unless you travel much and have to have conversation on the phone while driving. Anyway, bluetooth is just an expandability feature that almost every deck has but no one ever uses it. To me it's a feature that is used for pure advertisement. People hear bluetooth and they get excited and end buying the unit and never actually use it.
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