Learn about circuitry, how security systems work in a home, dimmer switches, fans, alarms and more with this my home electronics building kit with Snap Circuits. There's enough parts to build a house or small city building with real working 3D circuits. The kit includes 25 step-by-step, interchangeable projects, but that's just the beginning when you include your imagination!Details:3 AA batteries required (sold separately)For ages 8 and upContents:30+ projectsStep by step manualOver 60 Snap Circuits parts