My 3 button Homelink is only powered when in accessory mode. You need a key to power it up.If the car is parked out in your driveway and someone breaks in they can use it to open your garage door. Also if you are parked somewhere else and they break in and steal it and look in your glove box and see your registration or something else with your address on it they can they go to your house and open your garage door.
With the Homelink mirror it is only powered when the ignition is on.
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