We do not have a device on our car. I slide the gate card against the window until the sensor reads it. As I pull into the gate, I have the car/side mirror near the sensor, I hold my gate card against the closed window as I SLOWLY pull through, align the card with the sensor sliding it back and forth, watch the red button light change to green and the gate opens. Works on most gates but not all. Very handy on a rainy day.
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