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AUKEY FM Transmitter, Radio Transmitter Car Kit $6.99 + Free Shipping With Amazon Prime or $49 Order - Play Anything From Your Phone Onto Your Car's Radio. Great device for those with smartphones but older cars that don't have the bluetooth or auxiliary needed to play music from your phone. You just set it up and it send the music to an FM Station that you play through your regular car radio. You can also use this a microphone so you can do hands free calling in the car with it.