I’ve had 1 in all my cars for years. I doubt it would work on the rear view mirror because if I’m a foot or 2 away from almost hitting the stalk, mine won’t work.
Next time you drive up to a gate, place your card next to the rear view mirror to see if it opens the gate.
Also, this mirror chip saves on window motor usage, you don’t have to open your window in a downpour, and it saves time going thru the gate without scrambling for your card and rolling the window down. $25 we’ll spent
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