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Wayne Dalton is getting close to announcing a new Z-Wave based access device. The official name is "Room Key Controller" (model # WDHKC-50), which is similar to the card based systems you can find on hotel doors. You insert a generic room key card, and it will trigger a Z-Wave scene. An 'OFF' command will be sent whenever the card is removed. The controller will supports 'going to sleep' in order to make the batteries last for a long time. The device supports interacting with other Z-Wave device supporting the Z-Wave standard basic command set (and carries the "Speaks Z-Wave" logo, including thermostats.
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I think that is the main target of these types of readers, hotels and such.
I was recently at a Hotel in Switzerland and the way you enabled the lights in the room was by hanging up the key in a special holder, when you left the room and took the key out all of the lights went out. I thought it was really cool because it was an unobtrusive way to save power.