This is a real stress tester DIY kit. Make your own electric buzzer circuit. You test how stress resistant you are by moving the handle from one side of the circuit to the other. Of course, without touching the wire. Otherwise the buzzer will go off. The kit contains all the parts to build the stress tester. You only need two AA batteries and a Phillips screwdriver. The kit is designed to stimulate children's technical skills. In addition, they learn to think independently. The kit is suitable for children aged 8 and over under adult supervision.