Seresto 81857952 Adjustable Cat Flea & Tick CollarKills and repels fleas and ticks for 8 continuous months in one easy to use, non greasy, odorless collar. Quickly kills fleas within 24 hours of initial application. Highlights: For 8 month protection against fleas & ticks for kittens 10 weeks of age & older Starts to repel & kill fleas within 24 hours of initial application & re infesting fleas within 2 hours Works on contact with no painful biting required Repels & kills ticks within 48 hours of