The king lizard robot functions with two ai modes, "chase" and "escape "in “escape mode” when the infrared (ir) sensor is activated the frill will deploy, jaws open, and the led eyes will light up, all before scurrying away to a safe distance. In “chase mode” when the ir sensor is activated this stem robot will give an energetic frill display. If this smart toy does not sense danger it will follow like a pet. Tools that might be needed: diagonal cutter, phillips heads screwdriver, hammer, knife, safety glasses. Requires 4 “aaa” batteries, not included. Elenco teach products are based on stem activities (science, technology, engineering, math) to teach and encourage kids in their development, all while having fun! Perfect for future engineers ages 10+. # Pieces In Set: 90 Number of Batteries: 4 Learning Skill: Science Power Source: Battery (not Included) Recommended Ages: 10 Years And Up Measurements: 14.5 Length/Inches Assembly: Ready-To-Assemble Base Material: 100% Plastic Battery Size: Aaa Care: Wipe Clean Country of Origin: Imported p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 15.0px Calibri; -webkit-text-stroke: #000000} span.s1 {font-kerning: none} WARNING: CHOKING HAZARD – small parts. Not for children under 3 years.