This is a great add on if you want to regain control over the alarm, door locks, interior lighting, etc that you lost when you installed your Metra kit. It DOES NOT give you any control over the Onstar hands free blue tooth that is built in. I installed mine and wired it under my drivers seat so that it could not be seen. It is a very cheap looking white plastic that you will not want to keep out all the time in your new car. My recommendation is program everything where you want it to be before you take out your old radio and save $50.
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