Projects a soothing starry night sky onto the ceiling in four different colors Plays 3 lullabies, 7 nursery rhymes and more than 50 melodies to calm and soothe your baby Voice sensor activates calming music when your baby cries Volume and timer controls let you choose how loud and long the sounds play Requires 2 AA batteries (batteries included for demo purposes only; new batteries recommended for regular use); intended for babies from birth and up Sweet dreams are ahead with the Lil' Critters Soothing Starlight Hippo by VTech. This cuddly hippo projects a vibrant starry night sky onto the ceiling in four different colors to the sounds of peaceful tunes, seven nursery rhymes, nature sounds and lullabies. Colorful light effects enhance visual awareness, while the comforting sounds and songs help soothe them to sleep. This helpful hippo also responds to your baby's cries with calming music. The parent-friendly volume and timer controls let you choose how loud and long the sounds play. Sleep tight, little one!