The Snap Circuits Mini Music Box features brightly-colored electronic components that snap onto a clear plastic base. With this kit, you can build a music box that plays a song at the slide of a switch. Includes two additional projects: a Musical Doorbell and a Momentary alarm. Requires 2 AA batteries. Includes a colorful and easy-to-follow instruction sheet that make these electronic experiments easy and fun to build. Fun Fact Musical integrated circuits are used to entertain young children in many of the toys and chairs made to hold infants. If the music is replaced with words, the child can also learn while they are entertained. Because of great advances in miniaturization, many songs are stored in a circuit no bigger than a pinhead.