This by far the best collar ever. Years of other flea collars and greasy drops are over. Our cat has had the flea bite scabs and bumps on her head. Always scratching and chewing but no more. Less than a week after the collars were put on all her issues are gone. No more bumps and scratching. This is the collar we will be using from now on.
Only down fall was the shipping, they came from Singapore and delivered 2 weeks past due date. Small set back but worth the wait.