I am having a old Toyota Camry Which don't have Bluetooth. I also have a new Nissan sunny car. Which comes with inbuilt Bluetooth music system. This product works similar to my sunny Bluetooth. Intially I had some buzzy noise but now it works like my sunny after doing some research and found the right frequency. I recommend this product to whomever who wants to enhance Bluetooth for their old music system in their cars. Plugging in is not problem in my Camry 2007. Don't know about other cars.