With this experiment kit, children aged 8 and up can construct an impressive robot. Thanks to the sound sensor, the hedgehog knows exactly which movements to perform. It walks, raises its spikes, and even rolls backward. The glowing LED eyes indicate which mode the hedgehog robot is currently in. Plugging, clicking, and screwing together the 170 individual parts from the high-quality kit enhances fine motor skills and encourages systematic thinking while providing lots of building fun. The instructions detail the assembly process step by step. A comic story immerses children in the world of Nuna, Izzy, and Tom, offering exciting insights into robots and their mechanics. Contents: Components for assembling the robot, including a pre-programmed circuit board with sound sensor, motor, and gear parts, instructions, screwdriver. Additionally required: 4 x 1.5-volt batteries type L R03 (AAA, Micro), scissors or side cutters, file.