Aluratek's Universal Bluetooth Audio Receiver and FM Transmitter is the perfect way to utilize your car's cigarette lighter adapter port to enjoy wireless audio streaming through your car's speakers - cable free! Perfect for vehicles that do not have a built-in auxiliary port. Simply insert the audio receiver into your car's 12v cigarette lighter adapter port and pair to your Bluetooth enabled smartphone, tablet or MP3 player. Use the dial on the unit to seek out the best signal from any unused FM radio station to Bluetooth enable your vehicle's speakers with crystal clear results!The audio receiver and FM transmitter also features an integrated microphone so you can accept incoming phone calls with hands-free convenience. Easily switch between phone calls and music with the touch of a button.