Seresto Flea & Tick Collar for Kittens and Cats from 10 Weeks, Single Pack, Longest-lasting Protection, Odourless, Adjustable and Water-Resistant Cat Collar. Seresto is the longest-lasting flea & paralysis tick protection for kittens and cats. It is an easy to use, odourless, water resistant cat collar that protects cats from fleas and paralysis ticks for 8 months. Seresto harnesses innovative technology, allowing for the controlled release of low doses of the active ingredients into the cat's coat. It works fast and on contact, so there's no need for fleas and ticks to bite! Seresto kills adult fleas on your cat, larval flea stages in their surroundings, and controls flea allergy dermatitis. Seresto reduces the transmission of cat scratch disease and flea tapeworm. Safe to use on kittens from 10 weeks of age and any weight.