Bio-Spot Defense Spot-On 6-Month Topical Flea and Tick Treatment for Cats, Under 5-Pound It kills and repels fleas, ticks, and mosquitoes, and prevents flea egg reinfestation for up to 2-1/2 months Water-Resistant through rain and swimming It contains active ingredients to start killing fleas and ticks within 15 minutes Premium packaging panel with treatment schedule reminds pet owners when to reapply New and improved formula