The VTech Sit-to-Stand Learning Walker is a versatile and interactive stationary activity center for babies. It offers two modes of play: sit and play, and stand and walk. In the sit and play mode, babies can play with the various toys and activities on the center. In the stand and walk mode, the center can be used as a walker to support babies' first steps. The activity center features a removable play panel with buttons, gears, and a shape sorter. It also includes a pretend telephone and piano keys. The activity center is designed to promote motor skills, cognitive development, and physical activity.