Barney, model 5126, is a switch operated toy designed for use by children with upper extremity, cognitive, or mobility disabilities. By activating a connected capability switch (required but not included), a child can listen to Barney, the purple dinosaur, happily sing his favorite song, “I Love You”. POWER: Uses two AA batteries (not included). DIMENSIONS (HxDxW): 6 x 2 x 5 inches. WEIGHT: 0.05 pounds.