The Vibrating Fiber Optic Light, model 3191, is a switch- operated toy designed for use by children with cognitive, sensory integration, or severe physical disabilities. Activating a connected capability switch (not included) causes the vibrating fiber optic strings to swirl and reflect changing colors. POWER: Uses three double-A batteries. DIMENSIONS (HxD): The base is 3.25 x 3 inches; the fibers are 12.5 inches high. COLOR: Red, green, blue, green, and purple lights.