Mostly I disliked having to have it ready by 8:15 for our initial room steward. She told us we were NOT allowed to leave vials outside the room.Later on I did see many rooms with it left outside the door before bed. Not sure what the official rules is...much less intrusive if the night is OK. It did make me feel safer...but I also wore a mask for 60 days if not eating or drinking and came home healthy!!! We had a great cruise inspite of the covid changes.