"Small electronic kit produces the tune of ""When The Saints Go Marching In"" whenever the small push-button is operated. Produces a loud sound from a small mylar cone speaker. Features one custom music generator IC, one CMOS IC and a 3 transistor amplifiercircuit. Fun to build and operate! Use it to provide music alarms, unique sound outputs, etc. or just use it to play a song whenever you wish. Operates on a 9V battery (not included). Size of circuit board: 2"" x 2 3/4"". Complete with all parts, PC board and instructions. Skill Level 2. "