"There's a new king of the dinosaurs in the park the MATTEL Jurassic World Muscle Madness Tyrannosaurus Rex Action Figure! Its incredibly detailed design is sure to get any dinosaur fan excited! Buttons on the T. rex's back activate more features that bring the carnivore to life, including a ferocious chomp action, flexing muscles, and tail spikes. Muscle Madness technology allows the ""muscles"" in the neck, shoulders, and upper back to move and flex, creating a truly realistic appearance. Poseable arms and legs. A Tracking Code on the dinosaur's foot to activate the free Jurassic World Play app to unlock a digital version of the dinosaur and to play a racing game. Recommended for ages 4 and up. Length: 21.5"".Manufacturer model #: JKG92. Extremely detailed dinosaur toy Buttons on the back activate features Ferocious chomp action ""Muscles"" in the neck, shoulders, and upper back to move and flex Tail spikes pop up and fold down Poseable arms and legs Tracking Code on the dino's foot connects to the free Jurassic World Play app"