Flea collars rarely kill fleas, more-so it simply makes them jump off of the animal and onto your carpet, where you will then need to flea bomb your house. A better remedy can be attained by buying a flea repellant from your vet! Better investment and saves a lot of time.
I got this for my boy Cheddar once I noticed the flea scratch starting and it worked right away. He didn't seem to scratch anymore and didn't see any of those nasty bugs crawling in his fur. I would for sure get this again when he needs it