Cool sounds for the Ravensburger marble run system! The electronic GraviTrax POWER Element Sound provides an acoustic highlight in every track. With the GraviTrax POWER Element Sound, cool sound effects can be integrated into any GraviTrax track. There are invisible connections with all POWER transmitter elements. When a signal is received, an action-packed sound is triggered. It is possible to switch between a variety of sound worlds. In addition, atmospheric background music can be selected at the touch of a button. GraviTrax is a flexibly expandable, interactive marble run system for children aged 8 and up: With GraviTrax, children, teenagers and adults don't just build simple marble tracks. They create unique marble track worlds. By freely designing the marble tracks and exploring the rolling behavior of the marbles, the understanding of science is sharpened and gravity can be experienced first-hand. The GraviTrax universe includes three exciting lines - CORE, PRO and POWER. All GraviTrax lines and products can be freely combined with each other. Countless Extensions with classic building elements or stones that allow special action and tricks, the GraviTrax universe can be infinitely expanded. So everyone can tinker, try out and build beyond themselves individell.