Sorry I don't have experience with those products as I only have the AUX input cable, but when I buy something online, and the vendor doesn't show pictures of the product, I'm a bit scared. In those listings, only the Ipod connector is shown.
How big is the control box? Is it made of plastic or aluminum? what kind of wiring they use, the smallest possible to save cost?, or something bigger that can be handled without fear of breaking it?.

IMHO, you should follow the suggestions of board members, they went that route before.

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