A comfy mat, playful friends, music, sounds, and plenty of stimulating fun as baby grows-this gym has it all. Baby can bat at the roller ball for delightful music, watch sweet butterflies spin overhead, and kick the raised end panel for toe-tickling textures. When baby is old enough, the pillow wedge encourages tummy-time fun with a peek-a-boo mirror, jingling toucan and other toys. Includes 3 button-cell batteries.