Contains Insect Growth Regulator (IGR) to kill flea eggs and prevent reinfestation. Each applicator kills and repels fleas, ticks, and mosquitoes for up to 30 days. Features the Pet Specifix Applicator and Accu-Tip Dispenser. 4 month supply flea and tick control for puppies, toys and miniature dogs under 15 pounds. Kills and repels fleas, ticks and mosquitoes for up to 30 days. Kills flea eggs and prevents reinfestation. Permethrin, Methoprene, Other Ingredients: Size: UNDER 15 lb.