Remembering the panic of my aunt when she suffered a broken jaw and arm in a fall and couldn't communicate to the ER staff in speech or writing about her diabetic cat at home alone, I've always worried about leaving our two cats by themselves and then perhaps having a car accident or suffering a stroke when away from home. I carried a handwritten note tucked behind my driver's licence, but this card and keytag are much more visible. I showed them to our vet, who knows that she may be contacted in an emergency and will send a staff member to collect the cats and board them as long as necessary. I also gave the name of a neighbour who has a key to our condo and can let in the vet clinic staff member. My concern has been lessened considerably. I bought two sets and my husband also carries a card and keychain tag, more to humour me because he thinks I'm too pessimistic.