- Electric marble run with 20 steel balls that continuously spin along the track. - Demonstrates kinetic energy and principles of gravity and motion in an educational way. - USB powered, eliminating the need for disposable batteries. - Touch switch: tap to turn on, keep the light on, or turn off the device. - Additional orbital branches to create infinite loops and a hypnotic flow. - Advanced set that allows building more complex and creative structures. - Ideal for adults and mechanical puzzle enthusiasts. - Product size: 30.3 x 51.5 x 23.9 cm. - Color: Brown.