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