With this cool kit, you can build a fun water robot that swims and paddles on the surface of your bathtub or pool. You will learn about the components that make up a robot and how to assemble them. The unique feature of this water robot is that it is a so-called hybrid robot. This means that when the sun is shining, the robot converts solar energy into driving energy using a small solar panel. In darkness or indoors, it draws its energy from a battery. The set includes all the parts needed to complete the robot. Additionally, you will only need a screwdriver and a AAA battery.