1、RENEWABLE ENJOYMENT - The parts can be easily disassembled after completion of one robot kit. This allows for a steady source of learning and play along the way while making any of the 3 robot options. Whether building robots or robot dogs, this kit provides a good introduction to green technology. 2、POWERED BY THE SUN – Harness the free energy provided by the sun to power any of the 3 robot possibilities. There is no need for batteries as alternative energy sources will do the job. 3、GEARED FOR EXCITEMENT – The number of gears and moving parts will help in the development of future engineers. They will learn how each piece works with others to form a finished robot with motion capabilities. 4、BUILD A BOT – Step by step easy to follow instructions to complete each build included in instruction manual. Suitable for aged 8+ kids. Each robot move in their own unique fashion. Engineered with a gear box for smooth movements, this 13-1piece kit offers hours of fun. 5、EXCEPTIONAL DETAILS – All pieces of our toys are made with non-toxic ABS materials, certified by European and American Toy safety standards, ensuring kids play safer and reassure parents. Parts of stem toys are smooth without burr and precise assembly with a high degree of integration. Clever structure design makes multiple parts common and kids will love it and refuse video games.