Bring Prehistoric Power to Life: Build Your Roaring T-Rex Robot! Build a motor-driven T-Rex robot with roaring jaws, blinking eyes, and moving forearms! Engaging STEM learning, hands-on assembly, and a captivating dinosaur theme make it a must-have for young explorers! The kit includes essential components for an exciting dinosaur robotics experience: 1 motor, 1 battery case, 2 legs, 2 arms, 1 jaw, 2 eyelids, and detailed instructions .