Cards you are issued at hotels. Many now also control the entire power to the room, cause they want you to put them in the reader to power the room. But these also give access to the stairs and the elevators. So I have to always have to have my card. But there has to be a card in the reader or the power will go out. So I want go out for a bit, and then we have to hunt for the wife's card, so she will have lights, and power and stuff to recharge the laps and phones and cameras. But if she wants to leave, the room, for even 10minutes, the room turns off. So I ask the desk if we can have more cards? And yes they say, yes, here you are. So when we leave for the day out to do stuff, I take the extra card out and place it near the reader to save energy. And everyday, the room service took that card, and I would have to ask for another one. And after three times, I just asked for more cards straight up on re-entering the hotel, cause I knew the old ones were gone and no reason to go back down to the desk to get the extra cards. First world issues...