AmazonBasics Bluetooth Hands-Free Car Kit with 3.5mm Aux Jack Uses car's speaker system; plugs into cigarette lighter socket and 3.5mm audio jack plugs into the AUX IN port of your car (car stereo aux-in port required for use) Add Bluetooth functionality to your car: take phone calls and stream music.Use the USB port to charge other devices at the same time Built-in microphone: you can listen to phone calls through your cars stereo and speak through your receivers microphone Bluetooth 4.0 technology enabled Magnetic mounting disk: the disk adheres to any part of your vehicle and allows you to magnetically attach the controller and remove it when needed audio jack (auxiliary port)