FM transmitters
An FM transmitter sends audio from a smartphone to a car radio wirelessly, over an unused radio frequency. It's useful when the factory radio has no Bluetooth or AUX input: just plug the transmitter into the cigarette lighter socket and tune the radio to match. Many models also charge the phone through a USB port and show the caller's number on screen. When choosing, consider the connection method (Bluetooth or cable) and whether fast charging is included.
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