Insert the 10 double-sided learning blocks into the interactive Smart Star to hear sounds and phrases that introduce shapes and instruments Press the question button to hear requests to find specific blocks in the set. Press the music button for melodies and learning songs Build on top of the interactive Smart Star cube to trigger sound effects 30-piece set has everything to build a castle and more. Works with other LeapBuilders sets (each sold separately) Intended for ages 2+ years. Required two AAA batteries. Batteries include for demo purposes only, new batteries recommended for regular use Build a magical world with the LeapBuilders Shapes & Music Castle! Build, create and learn with this interactive 30 piece castle-themed block set. Kids can build using the easy-to-hold building blocks and double-sided learning blocks that feature instruments. Insert the 10 double-sided learning blocks into the interactive Smart Star and it will respond with educational songs and encouraging phrases about shapes and instruments that enhance building play with learning content. Build on the Smart Star cube to trigger sounds. Press the question button on the Smart Star to hear requests to find specific blocks in the set. The music button plays four learning songs and five melodies. Use the learning blocks from other LeapBuilders sets in the interactive cube to unlock additional content responses. Get building with smart blocks for smart kids. Intended for ages 2+ years. Requires two AAA batteries. Batteries included for demo purposes only, new batteries recommended for regular use.