As many already know, the Disney Dream and Disney Fantasy require that a card be placed in a card key switch in order for the stateroom lights to function.
The DCL suggestion is to use one of your room keys - which often results in a forgotten key when leaving the room.
So I have created the Light Card® card key switch activator!
It consists of a PVC card with artwork printed directly on the card (making it waterproof & long-lasting!) and a magnet on the back.
Put it in the slot while you're in the room, and then pull it out and use the attached magnet to hang it on the wall above the slot while you're out.
No more forgotten room keys!