Insert the 20 double-sided learning blocks into the interactive Smart Star to hear sounds and phrases that introduce letters and numbers. Press the question button to hear requests to find a specific block 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. 61-piece set has everything to build a house and more. Works with other LeapBuilders sets (each sold separately). Intended for ages 2+ years. Requires two AAA batteries. Batteries included for demo purposes only, new batteries recommended for regular use.