This is an intruder door alarm. You will learn how to make an electronic circuit to build an alarm. Install it at the door of your rooms and keep intruders out. If someone still tries to enter, the alarm will go off. The kit contains everything to build the alarm. You only need two AAA batteries and a Phillips screwdriver. The alarm is designed to stimulate the technical skills of children. In addition, they learn to think independently. The kit is suitable for children from 8 years old under adult supervision.