The Baby Einstein Cal's Sensory Shake-up Activity Rattle is a multi-sensory toy designed to engage baby in sensory play and encourage developmental milestones. 5 sensory features let baby explore new textures, build fine motor skills, and stimulate cause and effect learning with this BPA-free toy. Baby will love to explore the texture of Cal's antennae or create some noise by shaking the hourglass beads to create rattle sounds. For cause-and-effect discovery, infants can twist Cal's head to make a clicking sound or use the baby-safe mirror on the toy's base to promote self-discovery and delight. 4 rattle rings encourage fine motor skills or help parents teach color learning to toddlers. High contrast colors stimulate baby's visual development, and two easy-to-grasp handles make this battery-free toy a perfect way to engage baby on-the-go.