"The Meta.4 has 4 different models that can easily be dissembled and reassembled. The T-Rex walks on 2 legs with jaws that try to eat everything in its path. The Rhino Beetle has 6 legs and a gaping jaw. The Drill Vehicle has a rotating drill bit. The Robot has visible gears that shuffle it forward. Meta.4 is powered by sunlight, so batteries are never needed! Tools you may need: diagonal cutters and safety glasses. Perfect for young engineers age 8+.Elenco Teach products are based on STEM activities (Science, Technology, Engineering, Math) to teach and encourage kids in their development, all while having fun! All Teach Tech Green-Energy robots are powered by either water, wind, or sun, so there are no batteries required. Perfect for future engineers ages 8+."