Hartz® UltraGuard™ Reflecting Flea & Tick Collar for Cats and Kittens kills both fleas and ticks for 7 months. This collar has a clean, fresh scent and is water resistant. Additionally, the safety release snap reduces the risk of neck injury to your cat. The collar reflects direct light up to 300 feet. For use on kittens 12 weeks of age and older. USE ONLY ON CATS.