Have a Golf 4 in which I switched on the radio. (From Beta to a Sony Vw). Since I have absolutely no plan from one or expansion of radio and also never wanted to change anything at the cabling in the car itself (Vw uses a different current polarization), I invested the 10 Euros and had the new radio on after 10 minutes on easily ! If you do not do that at VW is said to destroy the "wrong" voltage the radio that! Since my new radio has cost 65,00 Euro, it was worth it to me like the 10 euros. The radio will now work only when the ignition is on, what my Autobaterrie is also sure to enjoy. I find this side effect and the adapter cable good! Processing seems very solid (for this purpose). Kam übrigends not as a package but with the postman as mail set after 2 days! From me a clear - Super!