Seresto is an odorless, non-greasy collar that kills and repels fleas and ticks on dogs for 8 continuous months. Its patented technology gives yout the performance you expect without having to remember monthly administrations. with its patented technology, Seresto offers a breakthrough of 8 months in flea and tick protection for dogs, setting it apart from conventional collars. Seresto combines two active ingredients, imidacloprid and flumethrin. The Bayer Polymer Matrix enables Seresto to provide a continuous, slow release of the active ingredients for 8 months. Seresto can be used alongside identification or restraining collars without damaging them. Seresto is water resistant and remains effective following a shampoo treatment, swimming or after exposure to rain or sunlight. Under normal conditions, effectiveness lasts for 8 months.