Control the entire T-Rex's movements by moving its tail! Press the button on the tail and it opens its mouth wide and roars. Because the mouth opens wide, it can also perform the action of eating minifigures. Compatible with the free app "Jurassic World Facts - Learn More About Dinosaurs!" which works with the figures. In the 8th picture, the screws are a little loose, making battery replacement difficult, but you can still replace the batteries. Operation has been confirmed. Batteries are not included. Will be shipped wrapped in bubble wrap only.