Lol...no, he HAS to carry it in his wallet :D. I've read that ANY card will work (even a playing card)...just looking for first hand knowledge though.
Any object will work because it's just a basic optical sensor, not a card reader. Most of our cruise we had a folded up piece of paper stuck in the slot - which is what our room steward told us to do! He completely advised against leaving the card in the slot at all because he said it's a real pain to get the staff to come open your door if you leave it in the slot and then leave the room without your card.
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Any object will work because it's just a basic optical sensor, not a card reader. Most of our cruise we had a folded up piece of paper stuck in the slot - which is what our room steward told us to do! He completely advised against leaving the card in the slot at all because he said it's a real pain to get the staff to come open your door if you leave it in the slot and then leave the room without your card.