VTech Stack and Sing Rings Stacking rings have an encouraging monkey that lights up and plays melodies and sing-along songs; base wobbles for added challenge and fun Fun sounds and songs play when the baby rings are stacked; discover numbers, colors, shapes and music 5 colorful rings and a variety of textures promote tactile development and baby play; infant learning stacker is great for baby Baby stacking toy includes 40+ songs, melodies, sounds and phrases Baby learning toy is intended for babies and toddlers 6 months to 3 years of age; 2 AAA batteries included for demo, use new batteries for regular use