by 
The Curious Bag
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Many car stereos are Bluetooth capable. If you have a car stereo that is Bluetooth capable, there are different things you can do with this feature.
Speakerphone
When paired with your mobile phone, your car stereo can be used as a speakerphone with your cell phone, allowing you to talk on the phone while driving.
Music
Bluetooth-capable car stereos can be paired with Bluetooth-capable mobile phones and MP3 players, allowing you to play music from those devices through your car stereo.
Phone Book
When paired with your mobile phone, some car stereos can display caller ID information about an incoming phone call on your car stereo's display, allowing you to decide whether or not you want to take an incoming call.
Hands-free Dialing
Bluetooth-capable car stereos allow users to make phone calls through the car stereo by simply saying the name of the person they would like to call.
GPS
Bluetooth-capable car stereos can be paired with GPS units. Once paired, the car stereo can broadcast turn-by-turn directions from the GPS through your car's speakers.
Source:
Popular Mechanics: How to Wire Into Your Bluetooth Car Stereo
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