First, make sure your, car radio has a grafted AUX IN or older models do not have any, but it becomes very rare.Si you are unsure what to consider before ordering. This being done, here is a very interesting device, which has several features top! It plugs into the cigarette lighter, the compact case (3 cm in diameter) is magnetized, it is also self collant.Grâce this small kit, you can listen to your downloaded music, you use it as a "hands free" kit for calling (the function that I favor) it has a built-in microphone, the sound is clear without parasitic echoes .From more if you're out of battery you can recharge your mobile! Instructions in French, very understandable.