Did mine 10 years ago. Almost forgot to remove it when I sold my old car. Put your card in a zip-lock plastic bag to keep the weather out.
Will NOT WORK if the mirror housing is made of metal or your paint is metallic paint.
Some gate readers are too high. SUVs won't have as much of a problem as sedans and sports cars, 'cause their mirror is higher. [ ADDED: Except the post above!!! ]
Saves wear and tear on the motor on your power window too.
Good luck,
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