AUKEY | FM Transmitter Car Audio Kit | BT-C4

FM Transmitter Car Audio Kit


  • Wirelessly broadcast audio from your mobile devices to your car's FM stereo system

  • Works with any device that has a 3.5mm audio output including Android, iOS and other popular audio devices

  • Also acts as a car charger with an extra USB port to charge any of your USB powered devices


Buy on Amazon


  • Model Number: BT-C4
  • Output: 5V 2.1A
  • Frequency Range: 88.1-107.9MHz
  • Interval: 0.1MHz
  • Operation Range: 5m / 16.4ft
  • Weight: 35g / 1.23oz


What's the purpose of FM transmitters?

FM transmitters allow you to play music or other audio from your phone with your car speakers by using a FM station. The station must be one that is not used in your area to avoid a static connection.

Can a car charger stay plugged in the car even while not in use?

Yes, they can stay plugged in when not in use. However even if the car is not running, the charger will continue to use a small amount of battery power, even if there is no device plugged in. This could affect the battery of your car if it is not driven for long periods of time.

Is it normal that my charger is heating up?

It is normal for a little heat to be emitted from the product, but it shouldn't be too hot to handle. In this case, please stop using the product and contact our support channel for more help.

Downloads & Manuals