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