Flea Collar

I was shopping for cat food the other day and this innocuous looking box on the pet store shelf caught my attention.  (It reads: Cat Eliminating Flea Collar.) I read it again and again and it  never sounded quite right to me.

Maybe it was the mood I was in but the English made a large red question mark appear over my head. I wondered how many collars a box that size would hold and how on earth you would get the flea to put one on. Appeal to its vanity perhaps? And those poor eliminated cats.