My wife 'stole' my Model S this morning to run a few errands. To punish her for this indiscretion I asked her to run it through the touchless car wash (yea, I know, but I don't have much choice around here). Anyway, after paying for the wash the car refused to put up the window and she had a "key not detected" warning and the car was turned off. I'd coincidentally just called her when this happened. The car was in for the 50K service recently and they changed out the battery in my fob, which I'd sent with the car, but hers had not been changed in quite some time. In any case, I opened the app, used the "Start Car" feature and all was well. I replaced the battery in her fob as soon as she got home (The service center had left the extra for her fob in the cup holder, which is pretty freaking cool), and all is well. Very satisfying to know that this is an option because it could have been quite inconvenient, would have obstructed traffic at the car wash and I'm not sure my wife knows exactly how to change the battery, it certainly would have take a while. Have I mentioned I love my car?