This kit provides everything you need to build your own solar-powered motorized walking astronaut! Learn how motors and auto transmissions work, while following easy instructions and having fun! Includes solar cell, plastic body, gears, shafts, motor, and all necessary parts. Also has the option to power by battery, accepting one AA battery (not included). Use switch to select sun power or battery operation. Recommended for ages 10 and up. Maximum power in sunny conditions and adequate indoor light.