Simple alarm from materials at hand

To create an alarm you will need: clothespin, bell, crown battery, switch, disposable plug, a pair of screws and a small motor. All components are mounted on the plank with hot-melt adhesive. The principle of the mechanism is quite simple and understandable. The size and autonomy (battery operation) of this alarm will make it easy to place it anywhere.

You can adapt the alarm to open doors or windows, as well as in places where there is no electricity.