Build over 500 projects. Contains over 75 parts including voice recording IC; FM radio module; analog meter; transformer; relay; and 7-segment LED display. Hours of educational fun; a great gift too! Includes Projects 1-511 manuals. Click here to download the Block Layout.Awards: The National Parenting Center-Seal of Approval, Dr. Toy 100 Best Children's Products, Dr Toy Best Educational ProductsRequires: 4-AA (not included)Ages: 8 and upWARNING CHOKING HAZARD- Small parts. Not for Children under 3 yrs.