Super Fun Musical Bouncing Toy: Loved by toddlers and babies alike. Hitting or falling the ball! The Bumble Ball for Babies will vibrate and roll on the floor and make interesting music Developing Baby’s Skills: The bright colors, bold patterns and easy-to-grasp bumps of the vibrating ball; Chunky sized bumps on the ball encourage reaching,grasping, crawling, and developing baby’s sensory skills Safe Materials: VANLINNY has strict requirements on the production process as a whole, all of materials used in bumble ball are safe for babies and durable Best Christmas Gift For Babies: This is the ideal gift for babies and toddlers 3+ year old! High quality and drop resistant; When little ones start learning colors, touching or crawling, this sensory toy will be a best gift Customer First: We stand behind our products and we take responsibility for our customers' purchases, If anything happens to your item within the first 18 months of owning it, Please contact us Battery Installation: The product requires 4 AA batteries; After installing the battery, tighten the screws; If the product is not working, please confirm again whether the positive and negative poles of the battery are correct