REPELS AND Kills fleas and ticks. Repels and kills ticks for 8 months, including Deer ticks (vector of Lyme disease and anaplasmosis), American dog ticks (vector of Rocky Mountain spotted fever and ehrlichiosis), Brown dog ticks (vector of ehrlichiosis, anaplasmosis, bartonellosis, canine hemoplasmosis, babesiosis, and Rocky Mountain spotted fever), and Lone Star ticks (vector of ehrlichiosis). Prevents tick infestations within 48 hours after application. Re-infesting ticks are repelled and/or killed as quickly as 6 hours. Treatment with Seresto kills fleas that may vector tapeworm infections (dipylidium caninum), bartonellosis (Bartonella vinsonii, Bartonella spp.), and rickettsiosis (Rickettsia felis), which are types of canine vector borne diseases. Re-infesting fleas are killed within 2 hours with protection against further flea infestation lasting8 months. Kills and repels fleas before they lay eggs. Seresto aids in control of flea larvae in the dog’s surroundings following contact with a Seresto-treated dog. Kills chewing lice. Aids in the treatment and control of Sarcoptic mange on dogs. No need to remove collar when your pet goes swimming or gets bathed. Bayer Polymer Matrix ensures that both active ingredients are continuously released in low concentrations. Make sure to replace the collar after 8 months for year-round tick and flea prevention. Light reflector for added visibility in the evening and at night.