very correct price / quality!

for short, I went to Youtube, the video installation are super simple and very well done, the boards are also to be taken as to put a reinforced tape over the magnetic adhesive tape, more often they are gray fabric-reinforced, we find in all good DIY stores, it avoids to see the tape to peel off in time and are no longer act properly, or at all.
Me after I installed the little beep from behind one of the rear speaker grilles, as there was no speaker in my car there (French car would have it), I took the opportunity to place it on small blast furnace, which is good to hear.
it works very well for the moment, I have not tried it in the rain, I can only recommend, Voila.