The Baby Einstein Cal's Sensory Shake-up Activity Rattle is a multisensory toy that encourages sensory play and promotes developmental milestones for babies. With this toy, babies can explore new textures through five sensory features, practice their fine motor skills, and stimulate learning about cause and effect. Babies will love exploring the soothing textures of Cal's feelers or making sounds by shaking the hourglass beads to create rattle noises. To discover cause and effect, toddlers can turn Cal's head to produce a clicking sound or use the baby-safe mirror at the base of the toy to encourage self-discovery and joy. Four rattle rings promote fine motor skills or help parents teach toddlers about colors. High-contrast colors stimulate the baby's visual development, and two easy-to-grasp handles make this battery-free toy the perfect companion for on-the-go play.