All parts are mounted on plastic modules and snap together with ease. Enjoy hours of educational fun while learning about electronics. No tools required. Includes Projects 1-305 manuals (includes all of the SC-100 projects and 200 new ones). Contains over 60 Snap-Together parts. Electrical components provide students ages 8+ with hands-on experience designing and building models of working electrical circuits. Snap-Together parts require no tools and ensure correct connections. Requires 4 "AA" batteries (not included) Clear and concise illustrated manual included and available online.