Advantage II Flea Spot Treatment for Cats is a su-purr simple way to protect your furbaby from pesky pests. This treatment delivers total flea protection in one single, monthly application. It quickly goes to work to kill adult fleas, flea larvae and flea eggs through contact, and then it keeps working for 30 days. The topical formula is easy to apply and free of fragrances, so there s no need to deal with hard-to-swallow pills or a prescription from your vet. This treatment is waterproof after 24 hours in case your best friend gets caught in the rain.