(Sergeant's) Natural Defense Squeeze-On for Cats provides safe all-natural flea, tick and mosquito control for cats and kittens. Natural Defense attacks a neurotransmitter found only in insects, causing a complete breakdown of the central nervous system and nearly instantaneous death. Formula includes oils of clove, peppermint, cinnamon, lemon grass and thyme. Kills and repels fleas, ticks and mosquitoes for up to four weeks. Do not use on kittens less than 12 weeks of age.