Gear driven tank powered by two AA batteries (not included). A relatively simple to build, no soldering required, educational kit. When fully assembled and switched on, this tank rolls forward, and climbs small obstacles. Includes parts, instructions and a small screwdriver. One small drawback, the instructions are in Chinese (click here to view). But, this is a pretty simple kit, and if you just look closely at the photos, of which there are plenty, and count the holes in the board, it is fairly easy to figure out.