All aboard the LeapBuilders® 123 Counting Train™! Build, create and learn with this interactive 19-piece train-themed block set. Kids can build using the easy-to-hold building blocks and double-sided learning blocks that feature occupations and numbers. Insert the 10 double-sided learning blocks into the interactive Smart Star™ cube and it will respond with educational songs and encouraging phrases about occupations and colors that enhance building play with learning content. Build on the Smart Star™ cube to trigger sounds. Press the question button on the Smart Star™ cube to hear learning phrases about occupations and colors. The music button plays five melodies and four learning songs. Use learning blocks from other LeapBuilders® sets in the interactive cube to unlock additional content responses. Get building with smart blocks for smart kids. Batteries included for demo purposes only, new batteries recommended for regular use.