Funny Rolling Ball Pet Dog Cat Weasel Motorized Appears Jumping Moving Alive Toys A Weasel Ball is a battery operated motorized ball that darts around to and fro, all while a relentless weasel gives chase. Oh, the craziness Cats love the Weasel Ball. And by love, we mean hate. Most cats hate the Weasel Ball and want to attack, scratch, bite and kill it. Perceptivity Developing (Color/Shape/Sound/Vision) Size:230mm x 83mm USES TWO AA SIZE BATTERY( NOT INCLUDED)