DFRobot BOSON Smart Science Kit - Earthquake Challenge is an earthquake working model, to study how to improve the buildings earthquake-proof level. This earthquake working mode combines a shake table and earth-proof structures from simple materials and BOSON modules. The model simulates seismic ground motion during an earthquake. With a rotation sensor, you can change the speed of the motor to generate movement at different frequencies. It will be inspiring to test the effect of short and high-frequency earthquakes on buildings. NOTE: 3xAAA batteries are NOT included with this kit and must be purchased separately.