The Musical Twister, model 3285, is a switch operated toy designed for use by children with severe physical or upper extremity disabilities. When a connected capability switch (not included) is activated, children watch a cylinder containing water with multi-colored glitter start to twirl while music plays . This toy is intended to improve visual attention and listening skills. It comes with two different choices for switch activation - on/off or momentary pause. POWER: Uses 6 C batteries. DIMENSION (HxLxW): 16 x 9 x 9 inches. WEIGHT: 6 pounds.