Snap Circuits Sound Science Kit

Hear! Hear! Learn all about sound and how it's made and heard. Build more than 185 projects using over 40 color-coded parts to actually see sound in action! This fun kit includes a keyboard with optical theremin, echo effects, a voice changer, sound-energy demonstration, and a color-changing light. But there's more here-download apps that analyze sound to your smart phone. Takes 4AA batteries (not included).