I use the adapter in the car (BMW 320 with AUX IN). When the vehicle ignition is off, the adapter is not powered by the cigarette lighter power. When the ignition starts, it connects to immediately and without any problems with my phone (Galaxy S4). A new coupling is not necessary. With many other adapters, however, that seems sometimes to be necessary, such as in the hanging on the stereo in my living room. The sound convinced quite where I believe that Bluetooth is always a compromise solution, because songs with extreme highs or lows are partly transferred unclean (listen at genaustem). I'm not sure if it is the adapter, on the cables, the AUX IN connector of my vehicle, or at least on my phone, that's ultimately the signal transmitter. All in all I can highly recommend the equipment but because it also is very small and it is easy in the car "hide" can. Do not know why I could pull off a star -> Recommended!