The interactive large T-Rex Action Figure features include: an IR Transmitter/Receiver, giving him the ability to recognize and interact with other dinos in the line, poseable arms, sounds/reactions in nose, forehead, and mouth. Two main features include a "bite" trigger, as well as a ROAR Position Trigger. Based on the Henson PBS show, Dinosaur Train is more than Dinosaur Play, it's a truly interactive dinosaur experience for kids. For ages 3+