Hyper Pet DOGGIE TAIL Crinkle Barking Wiggly Bouncing Dog Toy MOTION ACTIVATED 3 AAA batteries (not included), small screwdriver (not included) Jumping ball with tail with fun noises stimulate interest while motion detection encourages continued use. Tail makes Crinkle Noise,Hours of fun for your dog The perfect play toy for Hyper dogs and abundant entertainment for pet parents! 11" (28 cm) long, Ball measures approx. 3.5" (8.9 cm) diameter