- New
Assemble the no-solder components and discover 6 activities to make your own alarm.
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Includes real components (light sensor, buzzer, transistors etc.) and instructions illustrated in colour for the activities.
Included : 1 circuit board unit, 1 perforated cardboard image, 7 red wires, 7 white wires, 20 springs, 1 battery compartment, 1 buzzer, 1 light-emitting diode (LED), 1 NPN transistor, 1 PNP transistor, 1 capacitor, 1 light sensor and 1 support, 2 resistors, instructions sheet.