The Potaroma Cat Toys 3-in-1 Smart Interactive Electronic Kitten Toy is a versatile and smart toy that provides plenty of stimulation for your cat. The fluffy feather moves around in an unpredictable fashion, prompting your cat to swat and play like a whack-a-mole game. The lifelike butterfly flaps its wings, prompting your cat to pounce and bat the toy. The 4 balls included in the package add even more fun to the toy, as do the AA batteries (which are not included).