Smithsonian’s Wave Machine is a unique, relaxing and mesmerizing science machine perfect for your little scientist at home. This motorized wave machines teaches children about the physics of wave motion in our oceans and seas. The Smithsonian wave tank simulates wave motion in bodies of water. A colorful poster informs you about current, waves and tides! Intended for children and adults ages 14 years of play. 1 c battery is required, not included. # Pieces In Set: 2 Number of Batteries: 1 Included: 1 Instruction Manual(s) Learning Skill: Science Power Source: Battery (not Included) Recommended Ages: 14 Years And Up Measurements: 6 Height/Inches, 11 Length/Inches, 4 Width/Inches Assembly: Assembly Required Base Material: 100% Plastic Battery Size: C Care: Wipe Clean Country of Origin: Imported p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 15.0px Calibri; -webkit-text-stroke: #000000} span.s1 {font-kerning: none} WARNING: CHOKING HAZARD – small parts. Not for children under 3 years.