Sound and electronics come together with this science kit. Record your voice or music and play it back at different speeds and connect to your smart phone to analyze sounds with downloadable apps. With sound energy demo and color changing lights, build over 185 cool science projects! The fun and exploration will last for hours with over 40 parts to build with. Needs 4 AA batteries (not included). For ages 8 years and up.Snap Circuits Sound Dimensions: 18.2" x 13.2" x 2.4" WARNING: CHOKING HAZARD-Small Parts. Keep away from children younger than 3 years.