Assemble the components seamlessly and discover 6 activities to make your own alarm. The box includes real components (photosensitive sensor, buzzer, transistor ...). The set includes: 1 console, 1 perforated cardboard, 7 red wires, 7 white wires, 20 springs, 1 battery case, 1 buzzer, 1 light emitting diode (LED), 1 NPN transistor, 1 PNP transistor, 1 capacitor, 1 light sensor sensor and 1 support, 2 resistors. Requires 2 LR06 batteries (not included)