What is the little black box between the rear view mirror and the windshield?

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SHOBrad

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I assume that it's just the auto-dimming mirror processor but iIwant to be sure. I'm planning on replacing the mirror in my wife's '04 Expy with one that has an LCD screen for a backup camera and I don't want to take something out that is needed!

Thanks in advance!
Brad
 
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