I just use the card that came with the house. Hubby has one too. We carry them with us and use them if/when needed. Mine's in a silicone pocket stuck to the back of my cell phone case. If I'm too far from the card reader to just push the red button (or if the card reader doesn't have one) then I just hold the back of the phone up with my open window and voila - open gate.
If it's raining - my wrist and hand get wet. The phone's in a case, it can handle a couple of seconds of downpour.
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