The funny ball cat toy makes an irresistible rustling noise for stimulating playtimes cats find these toys so much fun that they keep coming back for more there is a battery powered ball inside the rustling bag which is continually moving and changing direction so there is no chance your pet will get bored the ball can be removed through a velcro sealed opening at the side of the bag replace the batteries by simply twisting the ball to open it up the ball takes 2 x aaa batteries not inc