BioSpot Spot On Flea and Tick Control for Cats contains 3.6% Methoprene and 40% Etofenprox. Kills fleas, flea eggs, and deer ticks up to one month. Kills and repels mosquitoes (that may transmit heart worm disease). Contains a natural coat conditioner. Safe for cats and kittens over 12 weeks of age. Choose from 3 month supply or 6 month supply. Choose from cats under 5lbs or over 5 lbs.