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The Best Way to Stream Music in an Older Car
The KM18 features a voltmeter that will show the condition of your car's battery. It's not exactly a feature you'd expect from a Bluetooth FM transmitter, but several of them do have it.
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Do FM Transmitter Apps Work? How to Transmit Radio From Your Phone
These devices usually plug into your car's auxiliary power outlet or are battery ... on the Bluetooth transmitter, as the person driving behind you can accidentally tune in to the FM frequency ...