Connect to car radio via headphone jack OK??

Yes this will work great for you!  I actually recommend it over the higher priced radio trancievers that you can purchase!  It works great with cassete adaptor and one thing many people do not know is that even if your tape deck eats tapes it will still work great because all that the device needs to transfer your tunes to the radio is the metal strip that takes the place of the actual casset film!  (in other words your tape deck will not eat it) lol! Hope this helps!