From the toy description:
This is the animatronic Tyrannosaurus rex that responds to noise or touch with over 100 different sounds and expressions, providing children with an interactive prehistoric pet. An internal system of servos, gears, and sensors form a biomechanical skeleton that delivers natural movements under a realistic reptilian skin. T. rex's eyes move, his tail wags, and he takes lifelike strides as he autonomously explores his environment. If he walks into a wall or furniture he will backtrack and growl at the impediment. Petting the back of the dinosaur's head elicits a grateful roar and calling his name prompts him to turn his head and walk toward the noise. A bone-shaped remote control has an "attack" button that prompts him to lunge forward and growl; pressing "guard" turns him into a sentry that scans a room for intruders and erupts with a hearty roar; pressing "prank" might cause him to release an ear-ringing belch.
Here the link for this Animatronic Tyrannosaurus Rex.