Adams Plus Flea & Tick Collar for Cats kills fleas, flea eggs, flea larvae, and ticks, tick larvae and tick nymphs for up to 7 months. The active ingredient specifically targets flea eggs and flea larvae stopping their ability to mature and infest your home. Adams Plus Flea & Tick Collar is an odorless, non-greasy alternative to topical treatments to kill fleas that may cause flea allergy dermatitis and flea bite anemia. This collar can also be worn with a regular collar. It is water-resistant and does not need to be removed if it gets wet.