With this experiment kit, children aged 8 and up can build an impressive robot. Thanks to the sound sensor, the hedgehog knows exactly which movements to perform. It walks, raises its spines, 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 plenty of building fun. The instructions detail each step clearly. Through a comic story, children dive into the world of Nuna, Izzy, and Tom, discovering exciting facts about robots and their mechanics. Contents: components for assembling the robot, including a pre-programmed circuit board with sound sensor, motor, and gearbox parts, instructions, screwdriver. Additionally required: 4 x 1.5-volt batteries type L R03 (AAA, Micro), scissors or side cutters, file.