The electronic cat toy ball will move and shake its body. The shaking frequency will stimulate kittens' hunting instinct. 2 Interchangeable hairstyles to choose from. The tumbler base of the cat toy ball will bounce up quickly after being knocked down by cats, which challenges and stimulates the cats again and again. Tumbler is made of Non-toxic and environmental friendly ABS material, it is safe for both of owner and kitten. Kit contains 2 different hairstyles, small screwdriver and 2 AAA batteries. How to use: unscrew the back of the tumbler, insert batteries and screw shut. Press the On/Off button and watch it tumble. Also available in Blue