The Smithsonian Wave Machine is a unique, relaxing and mesmerizing science Machine perfect for your scientist at home. This motorized Wave Machines teaches about the physics of Wave Motion in our Oceans and Seas. The Smithsonian Wave tank Simulates Wave Motion in Bodies of Water. Requires 1 C Battery, not included. This is the Perfect Birthday or Holiday Gift for anyone ages 14 Teen Years and up. Perfect for the desktop or nightstand.